The mollusks with the largest brain and most complex behavior are the:
a. chitins
b. cephalopods
c. gastropods
d. bivalves
e. chelicerates
b
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Birds generate a lot of heat, especially during flight. Yet the adipose tissue under their skin and the feathers atop their skin make it difficult to eliminate excess heat across the skin
Which of the following alternatives can absorb body heat and eliminate it from the bird most effectively? A) air in the air sacs B) lymph in the lymphatic vessels C) blood in the vessels D) blood in the heart E) urine in the bladder
A protein folded into an infectious conformation that is the cause of several disorders is called a(n) ____________________
Fill in the blank(s) with correct word
In CAM plants, such as cacti,
a. the stomata are open both day and night. b. the stomata are open during the day to let in carbon dioxide even though they cannot afford to lose the water. c. stomata are absent because water loss through them is too great. d. stomata open at night. e. guard cells are present but operate the reverse of the guard cells of non-CAM plants.
The main protein that is found in the thick filaments in the myofibrils is called ___________
Fill in the blank(s) with the appropriate word(s).