8. The two main sources of dissolved substances (such as salts) in seawater are volcanic eruptions from the Earth's interior and . * 1 point
a. chemical weathering of continental rocks
b. earthquakes at the continental margins
c. physical weathering of oceanic rocks
d. none of the above

Punnett squares are used to show possible combinations of alleles or to predict the probability of a trait occurring in offspring. an incomplete dominance cross is performed between a bird that is homozygous for red feathers and a bird that is homozygous for blue feathers. purple offspring result. then, two of the purple offspring are crossed. according to the punnett square for this cross, how many of the offspring from the second cross will have a feather color that results from incomplete dominance? 1 in 4 2 in 4 3 in 4 4 in 4