Starting billions of years ago, algae lowered the
atmosphere.
levels in the
a. oxygen
b. ozone
c. carbon dioxide
d. methane

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

Ayoung boy has been found and police are trying to locate his family they take a dna sample from him and begin collec dna samples from families who have missing children if police use dna samples only from the fathers, which type of dn technology can they use to identify the boy's parent? y-chromosome analysis omtdna (mitochondrial dna) analysis vntrs (variable tandem repeats) o pcr (polymerase chain reaction) analysis

Which is not a type of symmetry? a. asymmetryb. radial symmetryc. bilateral symmetryd. lateral symmetry