Which of the following is the primary source of oxygen in the Earth's atmosphere? OA
plants
OB
animals
OC
factories
OD
bacteria
Reset
Submit

When lactate builds up in a runners muscles it causes a burning sensation what causes this to occur

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.

Several billion years ago which gas was the least prevailant in the atmosphere