ACT PREP COMPLETE STUDY GUIDE WITH
PRACTICE TESTS AND HIGH-YIELD REVIEW
NOTES
| GRADED A+ | GUARANTEED SUCCESS
Updated 2026 Questions and Answers
100% Verified Exam Prep and Comprehensive
Rationales Included
,Bacteria Single-celled microorganisms
Basalt Solidified lava; a dense, gray, fine-grained igneous rock
Biomass Total mass of all the living matter within a given area
Biosynthesis The production of a chemical compound within the body
Boiling Point The temperature a liquid must be to change states from liquid to gas
Capillary A very slim tube; one of a network of extremely small blood vessels
Carbohydrate Sugars and starches that serve as a major energy source for animals
Catalyst An agent that causes or speeds up a chemical reaction
Celsius A temperature scale in which the freezing point of water is 0 degrees and the
boiling point is 100 degrees under normal atmospheric conditions
Cerebral Edema Brain swelling
Chlorophyll A green pigment produced in response to sunlight during photosynthesis.
Cholesterol A soft, waxy compound found in the body and in the food we eat.
Collinear 23 of 450
Collinear
Passing through or lying on the same straight line.
Comet A celestial body, having an elongated, curved vapor tail, which is seen only in that
part of its orbit that is relatively close to the sun
Common Difference The equal distance between one number in an arithmetic sequence and the next
(for example, the common difference between 4, 6, and 8 is 2.).
Common Ratio The ratio of one term and the next in a geometric sequence (for example, the
common ratio between 2, 4, and 8 is 4/2 and 8/4, or 2.)
Compressibility The ease with which pressure can alter the volume of matter
Congruent Equal in length or measure
,Cos Abbreviation of cosine
Cosine The ratio of the adjacent side (with respect to the angle of reference) to the
hypotenuse in a right triangle
Cube A term raised to the third power; a regular solid having six congruent faces
Cubic Inch The volume of a cube with edges that all measure one inch.
Cylindrical Having the shape of a cylinder, or a solid with circular ends and straight sides
Diagonal A line segment joining two nonadjacent vertices of a polygon or solid
(polyhedron).
Dilute To weaken the strength of a solution
Directly Proportional Increasing or decreasing together or with the same ratio
Ecology The field of science that concentrates on relationships between organisms and
their environments
Emissions Things that are discharged (often gases into the air).
Emit To release particles such as light, heat, or gases.
Epicanthic Fold A fold of skin of the upper eyelid that only partly covers the eye's inner corner
Equilibrium A state of balance
Erosion The wearing away of an object by outside forces, like wind or water
Evaporate To draw away moisture and convert into vapor
Experimental Variables Elements of an experiment that are changed (distinguished from the constant,
which is held the same in order to produce significant results).
Fahrenheit A temperature scale in which the freezing point of water is 32 degrees and the
boiling point is 212 degrees under normal atmospheric conditions
Fermentation The chemical process of breaking down an organic substance into simpler
substances such as the fermentation of sugar to alcohol
, Friction The force resistant to motion
Galvanism A direct electrical current produced by chemical reactions
Gas A fluid (such as air) that is not independent in shape or volume but tends to
expand
Gas Chromatograph A device used to detect the composition of an unknown material
Gastric Emptying The movement of the stomach's contents from the stomach to the small intestine,
and finally into the colon
Gravity The force of attraction between two bodies of mass
Herbivorous A plant-eating organism
Hydrogen Bonding The chemical bonding of a hydrogen atom with another electronegative atom.
Hypotenuse The longest side of a right triangle, which is always the side opposite the right
(90°) angle.
Igneous Rock Rock that is formed by the cooling and solidification of molten magma
Ignition Temperature The temperature that a fuel must reach before combustion can begin
Infrared Light energy having a wavelength greater the visible range; it is experienced as
heat.
Interior Angle An angle inside of a shape (that is, all of the interior angles in a triangle have a
sum of 180 degrees).
Intracellular Within a cell or cells
Isosceles Triangle A triangle with two congruent sides and two congruent angles
Isotopes Two or more atoms with an identical atomic number and differing in number of
neutrons.
Kelvin A temperature scale in which absolute zero is 0 degrees K, the freezing point of
water is 273 degrees K, and the boiling point of water is 373 degrees K
Law of Sines The relationship within a triangle of the sine of angles and the lengths of sides of a
triangle.
PRACTICE TESTS AND HIGH-YIELD REVIEW
NOTES
| GRADED A+ | GUARANTEED SUCCESS
Updated 2026 Questions and Answers
100% Verified Exam Prep and Comprehensive
Rationales Included
,Bacteria Single-celled microorganisms
Basalt Solidified lava; a dense, gray, fine-grained igneous rock
Biomass Total mass of all the living matter within a given area
Biosynthesis The production of a chemical compound within the body
Boiling Point The temperature a liquid must be to change states from liquid to gas
Capillary A very slim tube; one of a network of extremely small blood vessels
Carbohydrate Sugars and starches that serve as a major energy source for animals
Catalyst An agent that causes or speeds up a chemical reaction
Celsius A temperature scale in which the freezing point of water is 0 degrees and the
boiling point is 100 degrees under normal atmospheric conditions
Cerebral Edema Brain swelling
Chlorophyll A green pigment produced in response to sunlight during photosynthesis.
Cholesterol A soft, waxy compound found in the body and in the food we eat.
Collinear 23 of 450
Collinear
Passing through or lying on the same straight line.
Comet A celestial body, having an elongated, curved vapor tail, which is seen only in that
part of its orbit that is relatively close to the sun
Common Difference The equal distance between one number in an arithmetic sequence and the next
(for example, the common difference between 4, 6, and 8 is 2.).
Common Ratio The ratio of one term and the next in a geometric sequence (for example, the
common ratio between 2, 4, and 8 is 4/2 and 8/4, or 2.)
Compressibility The ease with which pressure can alter the volume of matter
Congruent Equal in length or measure
,Cos Abbreviation of cosine
Cosine The ratio of the adjacent side (with respect to the angle of reference) to the
hypotenuse in a right triangle
Cube A term raised to the third power; a regular solid having six congruent faces
Cubic Inch The volume of a cube with edges that all measure one inch.
Cylindrical Having the shape of a cylinder, or a solid with circular ends and straight sides
Diagonal A line segment joining two nonadjacent vertices of a polygon or solid
(polyhedron).
Dilute To weaken the strength of a solution
Directly Proportional Increasing or decreasing together or with the same ratio
Ecology The field of science that concentrates on relationships between organisms and
their environments
Emissions Things that are discharged (often gases into the air).
Emit To release particles such as light, heat, or gases.
Epicanthic Fold A fold of skin of the upper eyelid that only partly covers the eye's inner corner
Equilibrium A state of balance
Erosion The wearing away of an object by outside forces, like wind or water
Evaporate To draw away moisture and convert into vapor
Experimental Variables Elements of an experiment that are changed (distinguished from the constant,
which is held the same in order to produce significant results).
Fahrenheit A temperature scale in which the freezing point of water is 32 degrees and the
boiling point is 212 degrees under normal atmospheric conditions
Fermentation The chemical process of breaking down an organic substance into simpler
substances such as the fermentation of sugar to alcohol
, Friction The force resistant to motion
Galvanism A direct electrical current produced by chemical reactions
Gas A fluid (such as air) that is not independent in shape or volume but tends to
expand
Gas Chromatograph A device used to detect the composition of an unknown material
Gastric Emptying The movement of the stomach's contents from the stomach to the small intestine,
and finally into the colon
Gravity The force of attraction between two bodies of mass
Herbivorous A plant-eating organism
Hydrogen Bonding The chemical bonding of a hydrogen atom with another electronegative atom.
Hypotenuse The longest side of a right triangle, which is always the side opposite the right
(90°) angle.
Igneous Rock Rock that is formed by the cooling and solidification of molten magma
Ignition Temperature The temperature that a fuel must reach before combustion can begin
Infrared Light energy having a wavelength greater the visible range; it is experienced as
heat.
Interior Angle An angle inside of a shape (that is, all of the interior angles in a triangle have a
sum of 180 degrees).
Intracellular Within a cell or cells
Isosceles Triangle A triangle with two congruent sides and two congruent angles
Isotopes Two or more atoms with an identical atomic number and differing in number of
neutrons.
Kelvin A temperature scale in which absolute zero is 0 degrees K, the freezing point of
water is 273 degrees K, and the boiling point of water is 373 degrees K
Law of Sines The relationship within a triangle of the sine of angles and the lengths of sides of a
triangle.
