C Several conditions influence how much oxygen will be dissolved in water. The table below shows some of these conditions.
Ecosystem Condition
Effect on Dissolved Oxygen
photosynthesis
increases
decaying plants
decreases
increasing temperature
decreases
increasing salinity
decreases
increasing water depth
decreases
Toxic chemicals from a spill flow down a river to the ocean and kill most of the grasses in an estuary. What will most likely happen in the ecosystem?
<
Photosynthesis will decrease, decay will decrease, and so dissolved oxygen will increase
O Photosynthesis will increase, decay will increase, and so dissolved oxygen will decrease
Photosynthesis will decrease, decay will increase, and so dissolved oxygen will decrease
O Photosynthesis will increase, decay will decrease, and so dissolved oxygen will increase
decrease
1 2 3 4 5 6 7 8 9 10
Next
0

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.