Most biologists agree that the most recent common ancestor of all animals was probably a ____, an
idea first proposed by Ernst Haeckel in 1874.
a. jellyfish
b. ciliated protozoan
c. sessile sponge
d. chytrid
e. colonial, flagellated protist
E
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DNA replication is bidirectional in prokaryotes with circular chromosomes
Indicate whether the statement is true or false.
The stem cells from which sperm cells descend are called
A) spermatogonia. B) secondary spermatocytes. C) spermatids. D) patagonia.
Which of the following is true of vitamins?
a. they are inorganic substances needed in small amounts b. fat-soluble vitamins include C and B vitamins c. they are stored in body fat d. large amounts of vitamin K during pregnancy can cause birth defects e. taking large amounts of vitamin D can cause death
What does an electrocardiogram (ECG) measure? How does it work?
What will be an ideal response?