The earliest fossils of anatomically modern H. sapiens in Europe and most parts of Asia date to:
a. ˜2,000 years ago.
b. ˜4,000 years ago.
c. ˜10,000 years ago.
d. ˜40,000 years ago.
e. ˜100,000 years ago
d
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Biomagnification usually happens for chemicals that
A. are not readily degraded. B. dissolve in fat. C. dissolve in water. D. are not readily degraded and dissolve in fat. E. are not readily degraded and dissolve in water.
Your friend wants to know why birds such as boobies and birds of paradise have elaborate mating rituals. You explain that:
1.Behavioral rituals are a way to keep a bird from breeding with the wrong species, since the rituals are specific to each species. 2.Birds are social and need a way to attract a mate. 3.Birds have evolved mating rituals as methods to display their elaborate and beautiful plumage. 4.Mating rituals have evolved to keep males from mating with more than one female.
The protein Sonic Hedgehog (SHH) plays a role in specifying the identity of digits (such as fingers and toes) in mammals. Several digits arise directly from cells that both express and respond to secreted SHH. What type of signaling would this be considered?
A. synaptic B. paracrine C. autocrine D. direct contact E. endocrine
Which is the hormone that stimulates growth by increasing cell size or rate of cell division?
A) calcitonin B) oxytocin C) tropic hormone D) growth hormone