Air pressure is
a. gravity's pull on air molecules
b. higher the farther you are from earth's surface
c. about 5 lbs per square inch at sea level
d. difficult to measure

You can tell from this karyotype that the individual is female because the karyotype has two chromosomes labeled

Why has two different alleles for the same trait?

How do the sperm cells get from the stigma to the ovules? a. they slide down the petals to the bottom of the flower. b. they travel through pollen tubes. c. they travel along filaments. d. insects carry the sperm cells from the stigma to the ovules.