The Elodea then takes in the carbon dioxide, and produces the oxygen for the snail to take in. ... The amount of Bromthymol Blue in each test tube was important because it shows how much carbon dioxide they are producing. If the color changed, it meant that there was carbon dioxide in the test tube. Please mark brainlest
Density-dependent regulation can be affected by factors that affect birth and death rates such as competition and predation. Density-independent regulation can be affected by factors that affect birth and death rates such as abiotic factors and environmental factors, i.e. severe weather and conditions such as fire
Answer:
the firat one is 24 i think....
