Question

Question 6 (5 points) Question 6 Unsaved
Embryological studies suggest that the most ancient chordates were related to the ancestors of:
Question 6 options:

birds

dinosaurs

echinoderms

mollusks
Question 7 (5 points) Question 7 Unsaved
A cell that contains a nucleus and membrane-bound organelles is
Question 7 options:

multicellular.

prokaryotic.

heterotrophic.

eukaryotic.
Question 8 (5 points) Question 8 Unsaved
The members of a society
Question 8 options:

act independently for each individual's benefit.

are usually unrelated to one another.

belong to at least two species.

belong to the same species and interact closely with each other.
Question 9 (5 points) Question 9 Unsaved
What do freshwater flatworms use to remove excess water from body fluids?
Question 9 options:

flame cells

nephridia

kidneys

excretory pores
Question 10 (5 points) Question 10 Unsaved
A blastula is
Question 10 options:

a stage of development before a zygote.

the innermost germ layer.

a digestive organ.

a hollow ball of cells in an embryo.
Question 11 (5 points) Question 11 Unsaved
It is advantageous for grazing mammals to gather in groups because groups
Question 11 options:

can make the available food resources last longer.

are more difficult for predators to locate than individuals are.

can migrate more easily than individuals can.

offer greater protection from predation.
Question 12 (5 points) Question 12 Unsaved
According to Figure 26–1, the development of three germ layers occurred after the development of



Figure 26-1

Question 12 options:

vertebrates

deuterostome development

tissues

protostome development
Question 13 (5 points) Question 13 Unsaved
One advantage of sexual reproduction is that animals can:
Question 13 options:

create genetic diversity.

increase their numbers rapidly.

produce offspring that are genetically identical to their parents.

adapt to environmental change rapidly.
Question 14 (5 points) Question 14 Unsaved
If the body plan of an animal is considered bilaterally symmetrical,
Question 14 options:

the front and back of the body are symmetrical.

the left and right sides of the body are symmetrical.

the anterior end and the front side of the body are symmetrical.

the anterior and posterior ends are symmetrical.
Question 15 (5 points) Question 15 Unsaved
A parasite is a type of
Question 15 options:

carnivore.

symbiont.

filter feeder.

detritivore.
Question 16 (5 points) Question 16 Unsaved
In vertebrates, what joins the brain to the rest of the body?
Question 16 options:

spinal cord

peripheral nervous system

medulla oblongata.

vertebral column
Question 17 (5 points) Question 17 Unsaved
Fossils of the first animals are rare because they
Question 17 options:

lived only in volcanic regions, and were destroyed by lava flows.

had hard shells that broke down easily, leaving no trace.

were soft-bodied and tiny, therefore unlikely to fossilize.

were large and likely to be eaten by others after they died.
Question 18 (5 points) Question 18 Unsaved
One advantage to being an endotherm (instead of an ectotherm) is that an endotherm
Question 18 options:

needs more energy to maintain homeostasis.

can increase its body heat by sweating.

can generate its own body heat.

needs less energy to maintain homeostasis.
Question 19 (5 points) Question 19 Unsaved
You look at a sample of tissue under the microscope. You determine the sample is not from an animal because the cells in the tissue have
Question 19 options:

membrane-bound organelles.

nuclei.

cell walls.

cell membranes.
Question 20 (5 points) Question 20 Unsaved
The terms "inborn behavior" and "instinct" have the same meaning as
Question 20 options:

courtship behavior.

innate behavior

imprinting.

learned behavior

Answer 1

5 echinodermata
6 eukaryotes

Answer 2

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Heat is a form of energy.

In Thermodynamic, The change in internal energy of a closed system is equal to the amount of heat applied minus the amount of work done by the system.

And is represented by : ∆ U = Q - W

Wait a year I will try to solve it