Please help Star three is 138 light years away from Star 1 and 75 light years away from Star 2. Which of these conclusions about the stars is correct?

Star 2 is 213 miles away from Star 3

Star 2 is 63 kilometers away from Star 3

The light from Star 2 reaches Star 1 in 63 years

The light from Star 2 reaches Star 1 in 213 years

How many chromosomes are in a gold fish?

What are the doorways into and out of cells, attached to the membrane, and built in the rough er.

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.