Echinoderms are unusual invertebrates as they have all of the following except:a

an endoskeleton.
b. pentaradial symmetry.
c. a water vascular system.
d. pedicellariae present in some classes.
e. small disc-shaped flat bodies.


E

Biology & Microbiology

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You are studying a population of geese in which there are two color phases, brown and gray. Color in this species is controlled by a single gene, with brown dominant to gray. A random sample of 250 geese shows that 210 are brown. What percentage of the brown geese are heterozygous? (Assume that the population is in Hardy-Weinberg equilibrium.)  

A.  36% B.  43% C.  48% D.  57% E.  84% Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean?   Gather Content · What do you already know about the Hardy-Weinberg principle? How does it relate to the question?   Consider Possibilities · What other information is related to the question? Which information is most useful?   Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?   Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?

Biology & Microbiology

The protist that is most closely related to animals is the:

a. amoeba b. choanoflagellate c. dinoflagellate d. euglenoid e. paramecium

Biology & Microbiology

What type of metabolic pathway requires oxygen?

A) aerobic B) anaerobic C) photosynthetic D) fermentative

Biology & Microbiology

  Figure 35.9B   The following question refers to the figure above of a section through bone.   DA blood vessel is indicated by the letter ____.

A. A B. B C. C D. D E. E

Biology & Microbiology