Maria wants to know if birds prefer to eat in one place over another. She has three of the same bird feeders and fills them with the same amount of the same birdseed. She puts each of the feeders in her backyard: one feeder in a large dead tree, another feeder on the doghouse, and the last feeder in a small tree. She measures the amount birdseed eaten from each bird feeder after 5 days. What is the dependent variable?

(A) Amount of birdseed eaten
(B) Amount of time feeders are outside
(C) Locations of the bird feeders
(D) Type of bird seed

Bisphenol a (often called bpa) is a chemical found in products that people use every day, from water bottles to food containers to children's toys. unfortunately, bpa leaches out of its many products and makes its way into our bodies. what are the health effects of bpa exposure? ongoing research is finding that elevated exposure to bpa can affect a wide variety of developmental and physiological processes, but one of the first studies of bpa's health effects came about because of a simple mistake in the lab. at a laboratory at case western reserve university in 1998, geneticist patricia hunt was making a routine check of her female lab mice. as she extracted and examined developing eggs from the ovaries, she began to wonder what had gone wrong. she noticed that many of the eggs showed problems with their chromosomes, and some had irregular amounts of genetic material, which can lead to miscarriages and birth defects in mammals. she learned that a lab assistant had mistakenly washed the plastic mouse cages and water bottles with a harsh soap, releasing bpa from the plastic. knowing that bpa is an endocrine disruptor, a chemical that can enter organisms and mimic hormones, hunt set out to discover whether it had adversely affected her mice.

Hurry where is the majority of earth's water found? o glaciers o oceans ground o rivers and lakes

You are studying a protein that you call protein x. there is an aspartic acid at a key position in protein x which is important in the folding and stabilization of that protein. if this aspartic acid is changed to a different amino acid, which type of amino acid substitutions is most likely to allow the protein to fold normally?