The photoelectric effect describes when light shines on a piece of metal, and the metal releases electrons. Which model of light behavior best helps explain this effect? (2 points) Particle model Wave model Electromagnetic model Frequency model

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

An animal cell (left) and a plant cell (right) are shown.which organelle, labeled x in the diagram, is found in both plant and animal cells?

Which of the following cell structures is significantly different between gram- positive and gram-negative bacteria?