The theory that says Earth's continents once made up an ancient supercontinent, and have been drifting apart ever since, is called the theory of...
Natural Selection
Plate Tectonics
Gravity
Pangea
PLS HELP

Which taxon group is more specific, in regards to organisms that are in that group? mammalia animalia

In this case, the statement that people who exercise for an hour may have lower cholesterol levels 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.