What is the source of the carbon dioxide that is used in photosynthesis? O sunlight
O the soil
O the atmosphere
O the plant

In a certain ecosystem owls are predators for mice. the owl population increases and they eat more mice this causes the mouse population to decrease what happens next? a. the birth of mice increases. b. the birth rate of owls increases c. the population of owls decreases d. the population of mice increases

What came first egg or chicken? and is tomato a vegetable or a fruit?

What type of organism is a one-celled organism that functions as a single unit? a. bi-celled b. single-celled c. pre-celled d. multi-celled