What is the best reason a scientist might use a model to represent the solar system?
A. The actual solar system is too small.
B. The actual solar system moves too slowly.
C. The actual solar system is too simple.
D. The actual solar system is too large.

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.

When lactate builds up in a runners muscles it causes a burning sensation what causes this to occur

What is a photon? a. part of a ribosome b. a light particle c. a carbon dioxide molecule d. part of a chloroplast b.a light particle