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Biology 1108 Exam 3 Questions and Answers
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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:
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A. individuals of each species sharing the resources that they both
exploit.
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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. Ans: C.a move from the fundamental niche to the realized
niche for both species.
Cnidaria Ans: 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 Ans: Monophyletic group of animals with bilateral symmetry
Protostomes Ans: Bilaterian in whcih the blastopore first opening to
internal cavity of developing embryo becomes mouth
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Deuterostomes Ans: Bilaterian in which the blastopore, the first opening
to the internal cavity of the developing embryo, becomes the anus
Humans and chordates
Choanocytes Ans: Type of cell that lines the interior surface of a
sponge;have flagella and function in nutrition and gas exchange
Mesohyl Ans: Gelatinous mass lies between interior and exterior cell
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layers of sponge that contains some amoeba-like cells that function in
skeleton formation and dispersal of nutrients
Eumetazoa Ans: Monophyletic group of all animals other than sponges
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Gastric Cavity Ans: Cindarians, closed internal site where extracellular
digestion and excretion take place
Epidermis Ans: 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 Ans: 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 Ans: In cnidareans, gelatinous mass enclosed by epidermis
and endodermis
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Placozoans Ans: 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 Ans: Phylum of worms have a cylindrical body with
distinct segments and a bilaterian body plan
Mollusks Ans: Monophyletic group distinguished by a mantle which plays
a major role in movement skeleton-building, breathing, and excretion;
includes clams, snails, and squid
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Gastropods Ans: Mollusks
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-->Snails
-->Slugs
Cephaloppods Ans: Monophyletic group of mollusks
-->Squid
-->Cuttlefish
-->Octopus
-->Chambered nautilus
Distinctive adaptations-->well-developed eyes and muscular tentacles
that capture prey and sense the environment
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Bivalves Ans: Mollusks includes clams,oysters mussels, have enclosing
skeleton two hard shells connected by flexible hinge
Nematodes Ans: Roundworms, the most numerous of all animals; a
phylum of Ecdysozoa
Arthopoda Ans: Monophyletic group of animals includes insects and
contains more than half of all known animal species distinguished by
segmented bodies and jointed legs
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Chitin Ans: Modified polysaccharide containing nitrogen makes up cell
walls of fungi and hard exoskeletons of arthropods
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Insects Ans: Most diverse of four main groups of arthropoda
Chelicerates Ans: One of four main groups of arthropods including
spiders and scorpions; have pincer-like claws and are only arthropods
lack antennae
Myriapods Ans: One of four main groups of arrthropds, including
centipedsand millipedes; distinguished by their many pairs of legs
Crustaceans Ans: One of four main groups of arthropods, including
lobsters, shrimp, and crabs; two pairs of antennae and branched legs or
appendages
Metamorphosis Ans: Process in some animals in whcih body changes
dramatically at key stages in development
Pupa Ans: Quiescent stage of meetamorphosis in insects, during which
the body tissues undergo a transformation from larva to an adult
1
Biology 1108 Exam 3 Questions and Answers
(100% Correct Answers) Already Graded A+
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:
© 2026 Assignment Expert
A. individuals of each species sharing the resources that they both
exploit.
Guru01 - Stuvia
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. Ans: C.a move from the fundamental niche to the realized
niche for both species.
Cnidaria Ans: 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 Ans: Monophyletic group of animals with bilateral symmetry
Protostomes Ans: Bilaterian in whcih the blastopore first opening to
internal cavity of developing embryo becomes mouth
,For Expert help and assignment handling,
2
Deuterostomes Ans: Bilaterian in which the blastopore, the first opening
to the internal cavity of the developing embryo, becomes the anus
Humans and chordates
Choanocytes Ans: Type of cell that lines the interior surface of a
sponge;have flagella and function in nutrition and gas exchange
Mesohyl Ans: Gelatinous mass lies between interior and exterior cell
© 2026 Assignment Expert
layers of sponge that contains some amoeba-like cells that function in
skeleton formation and dispersal of nutrients
Eumetazoa Ans: Monophyletic group of all animals other than sponges
Guru01 - Stuvia
Gastric Cavity Ans: Cindarians, closed internal site where extracellular
digestion and excretion take place
Epidermis Ans: 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 Ans: 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 Ans: In cnidareans, gelatinous mass enclosed by epidermis
and endodermis
,For Expert help and assignment handling,
3
Placozoans Ans: 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 Ans: Phylum of worms have a cylindrical body with
distinct segments and a bilaterian body plan
Mollusks Ans: Monophyletic group distinguished by a mantle which plays
a major role in movement skeleton-building, breathing, and excretion;
includes clams, snails, and squid
© 2026 Assignment Expert
Gastropods Ans: Mollusks
Guru01 - Stuvia
-->Snails
-->Slugs
Cephaloppods Ans: Monophyletic group of mollusks
-->Squid
-->Cuttlefish
-->Octopus
-->Chambered nautilus
Distinctive adaptations-->well-developed eyes and muscular tentacles
that capture prey and sense the environment
, For Expert help and assignment handling,
4
Bivalves Ans: Mollusks includes clams,oysters mussels, have enclosing
skeleton two hard shells connected by flexible hinge
Nematodes Ans: Roundworms, the most numerous of all animals; a
phylum of Ecdysozoa
Arthopoda Ans: Monophyletic group of animals includes insects and
contains more than half of all known animal species distinguished by
segmented bodies and jointed legs
© 2026 Assignment Expert
Chitin Ans: Modified polysaccharide containing nitrogen makes up cell
walls of fungi and hard exoskeletons of arthropods
Guru01 - Stuvia
Insects Ans: Most diverse of four main groups of arthropoda
Chelicerates Ans: One of four main groups of arthropods including
spiders and scorpions; have pincer-like claws and are only arthropods
lack antennae
Myriapods Ans: One of four main groups of arrthropds, including
centipedsand millipedes; distinguished by their many pairs of legs
Crustaceans Ans: One of four main groups of arthropods, including
lobsters, shrimp, and crabs; two pairs of antennae and branched legs or
appendages
Metamorphosis Ans: Process in some animals in whcih body changes
dramatically at key stages in development
Pupa Ans: Quiescent stage of meetamorphosis in insects, during which
the body tissues undergo a transformation from larva to an adult
