If half the K-40 of a rock has
decayed into Ar-40, how old is
the rock?

Greenthe fossil record is the history of life recorded byhuman observationgod.climatologists.remains of the past.

The theories on the expansion of galaxies maybe re-examined to strengthen science should not be tested to strengthen science will weaken scientific knowledge if they change will become laws if they don't change

What do we call an individual that has inherited two identical alleles for the same trait? a.homozygous b.heterozygous c.monozzygous