BIOL 1108 Exam 3 – Principles of Biology II (Latest 2026/ 2027 Update) Guide| 100% Verified Questions & Answers

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