Lunar phases occur when the moon appears to change shape as seen from earth. what causes different phases of the moon?
select one:
a. the tilt of the axis of earth
b. the shadow of earth falls on the moon
c. the alignment of the sun, moon, and earth in a straight line
d. the amount of the sunlit side of the moon that faces earth

When does dna replication(make a copy of itself)?

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.

According to the cladogram, which organisms have roundworms as a common ancestor?