Gastrulation produces
a. hollow balls of cells.
b. embryos with primary tissue layers.
c. solid balls of cells.
d. maternal messages.
e. all of these
B
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Essentially all exchange of gases and other materials between the circulatory system and tissues of the body or the outside world (e.g., in the lungs) occurs in the
A. capillaries. B. arteries. C. veins. D. heart. E. lymphatic system.
Describe the different types of torpor
What will be an ideal response?
Which of the followings statements concerning the preprophase band is false?
a. It appears just prior to mitosis. b. It helps orient the mitotic spindle. c. It determines the plane of cell division d. It is found in both plant and animal cells. e. It is composed of microtubules.
Which statement best explains the finding that the nuclear DNA of house cats and African wild cats has a very high degree of similarity?
A. House cats and African wild cats share a recent common ancestor. B. Divergent morphological evolution has occurred. C. House cats and African wild cats are both members of the family Felidae. D. Environmental pressures were the same.