Which of the following statements about the diagrams below is TRUE? * 1 point
Pyrimidines
ΝΗ,
CH
NCH
HN
.CH
H
H
Cytosine
С
Thymine
Purines
NH
N
NH
NH₂
H
Guanine
G
H
Adenine
A
the molecules illustrated above bond with each other in long chains that are the two
sides of a DNA molecule
O each molecule illustrated above will only bond to one of the other molecules
O pyrimidines only bond to other pyrimidines and purines only bond to other purines
Ο Ο
pyrimidines bond to each other with two hydrogen bonds and purines bond to each
other with three hydrogen bonds

One statements is an example of a scientific observation. another statement is an example of a scientific explanation. identify the correct statement for each category to illustrate how scientific explanations are inferred from scientific observations.

Which of the following shows the correct order in which light information travels through the eye? (2 points) lens, pupil, retina, optic nerve pupil, lens, retina, optic nerve pupil, lens, optic nerve, retina lens, pupil, optic nerve, retina

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.