How do animals obtain the nitrogen they use to make proteins and nucleic acids? a. by consuming plants or other animals b. by absorbing ammonia from bacteria growing in the roots of plants c. by breathing the nitrogen present in the atmosphere d. by absorbing nitrogen found in the soil

Greenthe fossil record is the history of life recorded byhuman observationgod. climatologists. remains of the past.

Environmental impacts on evolution : mastery test

Which of the following types of stars is most likely to end up as a supernova? in graph a, the curve peaks at 800 nm, in the red section of the visible light spectrum. in graph b, the curve peaks at 550 nm, in the green section of the visible light spectrum. in graph c, the curve peaks at 450 nm, in the blue section of the visible light spectrum. in graph d, the curve peaks at 300 nm, in the violet section of the visible light spectrum. a b c d