Which is an example of an obligative response to an environmental factor?
1.Lizards basking in the sun more often at higher altitudes then at lower altitudes
2.Hummingbirds going into torpor at night when the temperature drops
3.Triggering of flowering by warming temperatures in the spring
3
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Amniocentesis poses increased risks to the fetus and mother
a. True b. False Indicate whether the statement is true or false
The left side of the heart contains which of the following?
a. pulmonary artery b. tricuspid valve c. oxygenated blood d. deoxygenated blood
Which hormones are primary endocrine products of the ovaries?
A. estrogen and follicle-stimulating hormone B. follicle-stimulating hormone and testosterone C. progesterone and testosterone D. estrogen and progesterone
The 14 species of Darwin's finches on the Galapagos Islands mainly differ in:
a) body size. b) tail length. c) song type. d) coloration. e) bill size.