As a direct result of cleavage, ________
a. a zygote becomes a blastula
b. ectoderm differentiates from endoderm
c. a blastula becomes a blastocoel
d. a blastula becomes a gastrula
a
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Predict the change in surface area and volume of a spherical cell if the diameter of the cell doubles:
A. The surface area will increase by a factor of 4, while the volume will increase by a factor of 8. B. The surface area will increase by a factor of 8 while the volume will increase by a factor of 4. C. The surface area will increase by a factor of 2 and the volume will increase by a factor of 4. D. The surface area and volume will both increase by a factor of 4.
The eukaryotes first appear in the fossil record
about ____ million years ago.
a. 1.8 b. 2.2 c. 2.7 d. 3.6 e. 1.5
The majority Neanderthal fossils have been found in
a. Asia b. india c. Africa d. Europe
Exocrine glands secrete all of the following EXCEPT ____.
A. mucus B. hormones C. earwax D. milk E. digestive enzymes