"A scientific theory is: Select one: a. an educated guess. b. a guess about how or why something happens. c. a statement that describes what always happens under certain conditions in nature. d. an explanation for events that are generally accepted as true."

When water freezes, it . contracts expands

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?

Explain what a zygote is. use the terms egg cell, sperm cell, and fertilization in your explanation.