Which two biogeochemical cycles depend directly on photosynthesis?
A. the oxygen cycle and the carbon cycle
B. the water cycle and the oxygen cycle
C. the carbon cycle and the phosphorus cycle
D. the nitrogen cycle and the phosphorus cycle

Look at the picture below . what does this picture represent ?

Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar. the following chemical equation shows the combustion of ethane. balance the equation by filling in the coefficients. c2h6 + o2 → co2 + h2o

Ascientist separates a population of mice into two groups. what would most likely increase the rate of speciation in this population. a. teach the two groups different tricks b. allow the two groups to breed with each other c. put the two groups in different environment d. have the two groups live in identical ecosystems