What class do spiders, scorpians and harvestmen belong to?
A. Arachnida
B. Arthropoda
C. Chelicerata
D. Crustacea
E. Malacostraca
Answer: A. Arachnida
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The convergence in external morphology of sharks,
penguins, and porpoises is attributed to a. reduced genetic variability in these groups. b. selection pressures that are common to these groups. c. reproductive isolation of these groups. d. identical genes in all three groups. e. use and disuse of the limbs.
Why are there not seven or eight levels to a trophic food chain?
A) lack of biodiversity B) lack of global energy C) lack of trophic efficiency D) lack of primary productivity
________ is the male sex hormone responsible for secondary sexual characteristics.
Fill in the blank(s) with the appropriate word(s).
Provide an explanation of the differences between differentiation and determination. Provide examples of each process and indicate how each is involved in development
What will be an ideal response?