BIOL 1108 Exam 3 – Principles of Biology
II (Latest 2026/ 2027 Update) Guide|
100% Verified Questions & Answers
When two species compete for similar resources, resource partitioning can alter the
niche of the species that compete. The figure shows an example of this.
Resource partitioning results in:
A. individuals of each species sharing the resources that they both exploit.
B.individuals of each species hybridizing in the region of overlap.
C.a move from the fundamental niche to the realized niche for both species.
D.a move from the realized niche to the fundamental niche for both species. -
CORRECTANSWER C.a move from the fundamental niche to the realized niche for
both species.
Cnidaria -CORRECTANSWER Phylum chartacterized by radial symmetry, 2 germ
tissues in the embryo; a closed internal gastric cavity, and well-developed tissues but
not organs; includes jellyfish, esea anemones, and corals
Bilateria -CORRECTANSWER Monophyletic group of animals with bilateral symmetry
Protostomes -CORRECTANSWER Bilaterian in whcih the blastopore first opening to
internal cavity of developing embryo becomes mouth
,Deuterostomes -CORRECTANSWER Bilaterian in which the blastopore, the first
opening to the internal cavity of the developing embryo, becomes the anus
Humans and chordates
Choanocytes -CORRECTANSWER Type of cell that lines the interior surface of a
sponge;have flagella and function in nutrition and gas exchange
Mesohyl -CORRECTANSWER Gelatinous mass lies between interior and exterior cell
layers of sponge that contains some amoeba-like cells that function in skeleton
formation and dispersal of nutrients
Eumetazoa -CORRECTANSWER Monophyletic group of all animals other than
sponges
Gastric Cavity -CORRECTANSWER Cindarians, closed internal site where extracellular
digestion and excretion take place
Epidermis -CORRECTANSWER Mammals, outer layer of skin, which serves as a
water-resistant, protective barrier.
Plants, outermost layer of cells in leaves, young stems (lacking secondary growth), and
roots. Outer layer of cnidarian body.
,Endodermis -CORRECTANSWER In plants, layer of cells surrounding the xylem and
phloem at the center of the root that controls movement of nutrients into xylem
Inner lining of cnidarian body
Mesoglea -CORRECTANSWER In cnidareans, gelatinous mass enclosed by epidermis
and endodermis
Placozoans -CORRECTANSWER Possibly simplest of all animals; each contains only
few thousand cells arranged into upper and lower epithelia that sandwwich an interior
fluid crisscrossed by network of multinucleate fiber cells
Annelid Worms -CORRECTANSWER Phylum of worms have a cylindrical body with
distinct segments and a bilaterian body plan
Mollusks -CORRECTANSWER Monophyletic group distinguished by a mantle which
plays a major role in movement skeleton-building, breathing, and excretion; includes
clams, snails, and squid
Gastropods -CORRECTANSWER Mollusks
-->Snails
-->Slugs
Cephaloppods -CORRECTANSWER Monophyletic group of mollusks
, -->Squid
-->Cuttlefish
-->Octopus
-->Chambered nautilus
Distinctive adaptations-->well-developed eyes and muscular tentacles that capture prey
and sense the environment
Bivalves -CORRECTANSWER Mollusks includes clams,oysters mussels, have
enclosing skeleton two hard shells connected by flexible hinge
Nematodes -CORRECTANSWER Roundworms, the most numerous of all animals; a
phylum of Ecdysozoa
Arthopoda -CORRECTANSWER Monophyletic group of animals includes insects and
contains more than half of all known animal species distinguished by segmented bodies
and jointed legs
Chitin -CORRECTANSWER Modified polysaccharide containing nitrogen makes up cell
walls of fungi and hard exoskeletons of arthropods
Insects -CORRECTANSWER Most diverse of four main groups of arthropoda
II (Latest 2026/ 2027 Update) Guide|
100% Verified Questions & Answers
When two species compete for similar resources, resource partitioning can alter the
niche of the species that compete. The figure shows an example of this.
Resource partitioning results in:
A. individuals of each species sharing the resources that they both exploit.
B.individuals of each species hybridizing in the region of overlap.
C.a move from the fundamental niche to the realized niche for both species.
D.a move from the realized niche to the fundamental niche for both species. -
CORRECTANSWER C.a move from the fundamental niche to the realized niche for
both species.
Cnidaria -CORRECTANSWER Phylum chartacterized by radial symmetry, 2 germ
tissues in the embryo; a closed internal gastric cavity, and well-developed tissues but
not organs; includes jellyfish, esea anemones, and corals
Bilateria -CORRECTANSWER Monophyletic group of animals with bilateral symmetry
Protostomes -CORRECTANSWER Bilaterian in whcih the blastopore first opening to
internal cavity of developing embryo becomes mouth
,Deuterostomes -CORRECTANSWER Bilaterian in which the blastopore, the first
opening to the internal cavity of the developing embryo, becomes the anus
Humans and chordates
Choanocytes -CORRECTANSWER Type of cell that lines the interior surface of a
sponge;have flagella and function in nutrition and gas exchange
Mesohyl -CORRECTANSWER Gelatinous mass lies between interior and exterior cell
layers of sponge that contains some amoeba-like cells that function in skeleton
formation and dispersal of nutrients
Eumetazoa -CORRECTANSWER Monophyletic group of all animals other than
sponges
Gastric Cavity -CORRECTANSWER Cindarians, closed internal site where extracellular
digestion and excretion take place
Epidermis -CORRECTANSWER Mammals, outer layer of skin, which serves as a
water-resistant, protective barrier.
Plants, outermost layer of cells in leaves, young stems (lacking secondary growth), and
roots. Outer layer of cnidarian body.
,Endodermis -CORRECTANSWER In plants, layer of cells surrounding the xylem and
phloem at the center of the root that controls movement of nutrients into xylem
Inner lining of cnidarian body
Mesoglea -CORRECTANSWER In cnidareans, gelatinous mass enclosed by epidermis
and endodermis
Placozoans -CORRECTANSWER Possibly simplest of all animals; each contains only
few thousand cells arranged into upper and lower epithelia that sandwwich an interior
fluid crisscrossed by network of multinucleate fiber cells
Annelid Worms -CORRECTANSWER Phylum of worms have a cylindrical body with
distinct segments and a bilaterian body plan
Mollusks -CORRECTANSWER Monophyletic group distinguished by a mantle which
plays a major role in movement skeleton-building, breathing, and excretion; includes
clams, snails, and squid
Gastropods -CORRECTANSWER Mollusks
-->Snails
-->Slugs
Cephaloppods -CORRECTANSWER Monophyletic group of mollusks
, -->Squid
-->Cuttlefish
-->Octopus
-->Chambered nautilus
Distinctive adaptations-->well-developed eyes and muscular tentacles that capture prey
and sense the environment
Bivalves -CORRECTANSWER Mollusks includes clams,oysters mussels, have
enclosing skeleton two hard shells connected by flexible hinge
Nematodes -CORRECTANSWER Roundworms, the most numerous of all animals; a
phylum of Ecdysozoa
Arthopoda -CORRECTANSWER Monophyletic group of animals includes insects and
contains more than half of all known animal species distinguished by segmented bodies
and jointed legs
Chitin -CORRECTANSWER Modified polysaccharide containing nitrogen makes up cell
walls of fungi and hard exoskeletons of arthropods
Insects -CORRECTANSWER Most diverse of four main groups of arthropoda
