Two species of frogs mate with each other. the embryo dies after a few cell divisions. what kind of reproductive isolation does this example represent? a. temporal isolation b. mechanical isolation c. postzygotic isolation d. gametic isolation

What would be the result if crossing over did not happen during meiosis in humans? a. there would be less genetic variation in humans. b. parents would be more likely to look like their children. c. the human population could not reproduce. d. children would have more chromosomes.

Transmission electron microscope are best for viewing a) microorganisms in pond water b) internal organs of a mouse c)internal structures of a cell d) surface features of a specimen

What is the next step in muscle contraction after the actin changes shape? (apex)