Which of the following scientific achievements best represents a collaborative effort among
scientists?
O Gregor Mendel's study of pea plants enabled Thomas Morgan to become the
first to locate a gene on a chromosome in Drosophila.
O Anton van Leeuwenhoek invented the microscope in the 1600s, which was later
used by others to study cells.
Robert Koch studied infectious diseases, and Louis Pasteur demonstrated that
life only comes from life.
Francis Crick and James Watson worked together to design the double-helix
model of DNA

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.

Explain how organisms could be harmed by high levels of salt from roadways?

Glycogen is an energy-storage molecule in humans. a hormone that is called insulin controls the storage of glycogen in the liver. insulin is made up of amino acids.