Types of natural selection: paleontologists find a series of fossils believed to be the ancestors of modern giraffes. Early fossils have a short neck, later fossils have longer necks. Which type of natural selection influenced giraffe necks?
A) directional
B)sexual selection
C) stabilizing
D)Disruptive

Which medullary index indicates a human hair? a. 0.653 b. 0.733 c. 0.516 d. 0.256

Cold case files recently began re-investigating an old murder case. the murder took place in the park; a young man, james, was hit over the head with a brick and killed. police suspected the jealous former boyfriend of james' wife, karen. whoever killed james may have washed their hands in a near-by bird bath as detectives found blood in the bird bath. since the murder took place before dna fingerprinting was available, the suspected killer, ronnie, went free. detectives are now reviewing the blood evidence using dna fingerprinting. based on the dna fingerprints of all possible suspects, who is james' killer?

Match the functions to the cell types ? contraction and relaxation. conducting electrochemical signals fighting diseases carrying genetic material