Dogs have ________ and snails have _______

a. exoskeletons; hydroskeletons
b. exoskeletons; endoskeletons
c. hydroskeletons; endoskeltons
d. endoskeltons; exoskeletons
e. endoskeltons; hydroskeletons


E; Dogs, as vertebrates, have an endoskeleton. Snails (and many other invertebrates such as worms) have only soft body parts and rely on muscles acting against confined fluid spaces in order to move.

Biology & Microbiology

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What would happen if all of the structures corresponding to the one labeled 6 in Figure 41-1 were

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A lipid membrane is present in which of the following?

A) naked viruses B) enveloped viruses C) prions D) viroids E) both prions and viroids

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According to the law of independent assortment,

a. all possible combinations of factors can occur in the gametes. b. only the parental combinations of gametes can occur in the gametes. c. only the nonparental combinations of gametes can occur in the gametes.

Biology & Microbiology

The concept of evolution has always been connected with some notion of progress–natural selection pushing populations toward better and better adaptations to create "perfect organisms." How would you argue that evolution does not craft perfect

organisms? What will be an ideal response?

Biology & Microbiology