Tectonic plates are pieces of the that float on the more semi-solid below.

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

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.

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion