Can someone please help me and please no links

Leila has dimples because she received a gene copy from her father that coded for dimples. this means that dimples are an example of a trait that is

Why does meiosis produce cells with half the chromosomes? o a. most of the chromosomes are not necessary to keep an organism alive. b. a gamete needs only half the number of chromosomes because two gametes join together. o c. it makes the gametes easier to move around in the organism. o d. it is faster to produce gametes with fewer chromosomes.

What was the land like over 500 million years ago? what was under the sea?