Which conditions are necessary for natural selection? Check all that apply. Populations do not have genetic variation. Populations have genetic variation. The environment changes. The environment stays the same. Organisms must have specific traits in order to survive and reproduce. Organisms with any traits will survive and reproduce. Answers: 2,3,5

Abullet found at a crime scene may be used as evidence in a trial if the percentage of metals match to the composition of metals in a bullet from the suspect's ammunition. a forensic scientist's analysis of the bullet shows that it contains 11.9 g of lead, 0.5 g of tin, and 0.8 b of antimony. what is the percentage of lead metal in the bullet? express your answers to the one's place.

Iwll give extra points to who gets this for ! what type of reaction is this? ?

Word equation for k(s)+h2o(l) yield koh(aq) + h2(g)