Maintaining a constant internal environment for all biological process is known as what?
a. regulation
b. homeostasis
c. adaptation
d. energy usage
b. homeostasis
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One adaptation to flight in birds is lighter bones, which lack
A. collagen. B. medullary cavities. C. calcium. D. the periosteum. E. bone marrow.
A study of a cohort of 1,000 animals showed a
90 percent death rate per individual in the first year, 10 percent the second year, and 5 percent the third year. This population's survivorship is a. type I. b. type II. c. type III. d. type I the first year and type II in years two and three. e. type I the first year, type II the second year, and type III the third year
Briefly discuss the complementary functional roles of insulin and glucagon What will be an ideal response?
In recent times, it has been shown that adult cells can be induced to become pluripotent stem cells (iPS). To make this conversion, what has been done to the adult cells?
A) A retrovirus is used to introduce four specific regulatory genes. B) The adult stem cells must be fused with embryonic cells. C) Cytoplasm from embryonic cells is injected into the adult cells. D) The nucleus of an embryonic cell is used to replace the nucleus of an adult cell.