Nematodes and rotifers have a body cavity that is
(a) called a coelom.
(b) called a pseudocoelom.
(c) completely lined by tissues derived from mesoderm.
(d) both a and c.
(b) called a pseudocoelom.
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Scientists that focus on small individual parts of a living system are using a(n) ____ approach
a. systemic
b. microbiological c. reductionist d. molecular e. bioinformatics
What is an otolith?
a. sensory hair b. proprioceptor c. small microvilli d. gelatinous structure e. calcium carbonate crystal
Tiktaalik appears to:
a) be a descendant of the one branch of ancestral horses that survived until today. b) be a "living fossil" since it resembles many of the earliest fish, yet populations thrive today. c) represent a transitional species, somewhere between fish and land animals. d) be an extinct species of fish that was also able to fly, due to flaps of skin between its fins. e) be an extinct species of giant fish that was subject to strong selection for smaller body size.
Do you believe that natural selection could have also affected the behavior of humans towards dogs over time? Why or why not? Provide a short explanation of how this might have happened
What will be an ideal response?