What is most likely to cause a faster rate of blood flow?

Amines amides and amino acids are categories of

Ihave no idea how to solve these. plus there's another question that is 2) a 10 kilogram meteorite is collected in space and brought back to earth. it is composed of 1.25 kg of uranium-238 and 8.75 kg of lead-206. how many u-238 half lives have passed? what is the approximate age of the meteorite?

In general, characteristics that an organism survive and reproduce become more common in a population over time. what mechanism of evolution cause this change?