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

When is your respiration rate likely to change? a. when your intestines are digesting b. when your cells have too much glucose c. when your cells need more oxygen d. when your liver is working after a meal

What is an endocrine function? (apex) a. esophageal glands release mucus into the esophagus b. salivary glands release saliva into mouth c. swear glands release sweat to the skin d. the pineal gland releases melatonin into the bloodstream

Why are fossils not found in igneous rocks? igneous rocks are made from cooling of lava or magma. igneous rocks are found too deep underground. igneous rocks are too dark in color to contain fossils. igneous rocks are too dense to contain fossils.