Which of the following statements are accurate? (MORE THAN ONE ANSWER)
A. Invertebrates are animals that lack a backbone
B. Ecdysozoans typically have an exoskeleton
C. Bilaterians include three clades:
1) Deuterstomia
2) Lophotrochozoa
3) Ecdysozoa
D. Givens about animal "A'
I. the animal has three prominent germ layers
II. an animal has bilateral symmetry
III. the animal lacks a backbone
You would be able to classify this animal, animal A, as a bilaterian
E. All animals share a common ancestor

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.

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?

Explain why scientists use the word dominant for certain traits.