Darwin's experiments are just one way to study phototropism. a student wants to investigate the
effects of phototropism in bean plants. she places a light source directly above one plant, at a forty‐five
degree angle to another, and at a ninety‐degree angle from the third.
a. what is her independent variable?

How do you date a sample of rock that you suspect as being one of the earliest on earth

Cassandra made a venn diagram to compare and contrast the two stages of cellular respiration. which belongs in the area marked x? energy is released. oxygen is used up. glucose is broken down. carbon dioxide is used up.

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