Why is all of geologic time before the Cambrian Period sometimes collectively lumped together called the "Precambrian"?

A-We have very few fossils from the time
B-Nothing lived during that time
C-The time period was very short
D-Everything from that time was destroyed by volcanos.​

Aparent with freckles is crossed with a parent without freckles. the punnett square shows the possible genotypes and phenotypes of the offspring. which statement accurately describes the probability of phenotypes? a.the offspring are more likely to have freckles. b.the offspring are more likely to have no freckles. c.the likelihood of the offspring having freckles and not having freckles is the same. d.the likelihood of the offspring having freckles and not having freckles cannot be determined.

What is used as a template during replication? a- mrna b- trna c- rrna d- dna

Warmer ocean surface water would most likely be found near