In support of the Recent Africa Origin hypothesis, the oldest dated fossils of H. sapiens found in
Africa are reliably dated at 100,000 years old.
____________________ Indicate whether the statement is true or false.
F, 195,000 years
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An embryo that is composed of a hollow ball of cells is called a blastocyst
a. True b. False Indicate whether the statement is true or false
Contrast in microscopy is most commonly achieved by:
a. changing objectives for various specimens. b. increasing the resolution or resolving power. c. staining techniques. d. adding a blue filter to the light path.
Which of the following organisms could result from a developing embryo where the mouth
develops second?
a. earthworm b. clam c. beetle d. starfish
When measuring membrane potential, the tip of a microelectrode is inserted into a(n)
a. axon. b. node of Ranvier. c. Schwann cell. d. dendrite. e. glial cell.