A human embryo is capable of movement and has gonads that are distinguishable as either testes or ovaries by the end
of the:a.
second week.
b. fourth week.
c. sixth week.
d. eighth week.
e. first trimester.
e
You might also like to view...
What important resource do Schwann cells and oligodendrocytes provide to neurons?
A. oxygen B. nutrients C. physical strength from microtubules D. Ca2+ currents E. insulating layers of membrane
Many sea snakes have adapted to a completely marine existence. What are 3 adaptations of sea snakes that have allowed this lifestyle?
What will be an ideal response?
When a farmer grows cotton containing the gene for Bt toxin, they often leave a strip of non-Bt cotton around the outside of the field for what reason? Select one:
a. to allow some rr bollworm caterpillars to survive b. to allow the non-Bt and Bt cotton plants to cross pollinate c. because the non-Bt cotton does not drive the moths and caterpillars to extinction d. because the non-Bt cotton grows better e. to allow some RR bollworm caterpillars to survive and limit selection pressure for resistance
What is immunity?
A. An organism’s capacity to resist infection only B. An organism’s capacity to both resist and combat infection C. A pathogen D. An organism’s capacity to combat infection only E. A set of genetic instructions