How much oxygen is contained in the atmosphere?
a. 20%
b. 21%
c. 22%
d. 23%

what is slowed when water is a limiting factor in an environment?
a. amount of evaporation
b. population growth
c. the types of rocks

Plants that have reproductive structures called cones are?

Which of the following are the ingredients that go into the plant and are needed for photosynthesis? select all that apply. 1.) soil 2.) seeds 3.) carbon dioxide 4.) minerals 5.) glucose (sugar) 6.) water 7.) light energy (sunlight) 8.) oxygen 9.) air

What does the positioning of transcription factors determine?