In mammals, which reaction to cold limits the amount of heat an animal loses to its surroundings?
a. shivering
b. pressing hair shafts close to the body
c. reducing blood flow to the skin
d. going off to lie alone so that others do not take their heat
Ans: c. reducing blood flow to the skin
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A pesticide targets the endodermal layer in developing mosquitoes. Based on this, which of
the following will likely not develop correctly?
a. muscles b. gut c. outer exoskeleton d. reproductive system
At which point during pregnancy can human chorionic gonadotropin be detected in the mother’s blood?
1.at the time of fertilization 2.at the time of implantation 3.by the first week of pregnancy 4.by the third week of pregnancy 5.by the sixth week of pregnancy
The first mammals reproduced by means of
A. an egg. B. a pouch. C. a placenta. D. asexual reproduction.
Classification.The terms below relate to the movement of materials and membranes. Answer the following questions by selecting the correct term.
A. Spontaneous movement of molecules B. Fluid with a high solute concentration relative to another fluid C. Movement of molecules would be out of this fluid D. Movement of molecules would be into this fluid E. Fluid with a low solute concentration relative to another fluid F. Movement of molecules across a membrane would be equal G. Fluid with the same solute concentration relative to another fluid H. Movement of water molecules across a membrane I. Pressure that prevents the movement of water into a cell despite a hypotonic internal environment J. Pressure from a fluid against a boundary that contains it