Which of the following statements about the greenhouse effect is true?

A. Life on earth is suffering because of the greenhouse effect.
B. All greenhouse gases are harmful.
C. Life on earth would not exist without the greenhouse effect.
D the greenhouse effect is caused by human activity.

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