In the nitrogen cycle, which organisms are responsible for converting ammonia into nitrates that can be used by plants?

A) nitrogen-fixing cycle

B) decomposes

C) nitrifying bacteria

D) denitrifying bacteria

What would happen if a plant's xylem was completely blocked?

Carbon dioxide made by cells leaves your body through the respiratory system by moving from the A. alveoli to the bronchi to the bronchioles B. bronchi to the bronchioles to the nose C. trachea to the bronchi to the bronchioles D.

Which best explains the high surface tension of water? its high density its ion-dipole interactions its adhesive interactions its hydrogen bonding interactions

Within a particular population, darkly colored rats are more likely to survive than more lightly colored individuals. This situation is likely to result in a. directional selection. b. stabilizing selection. c. disruptive selection. d.

Which structure is NOT present in most vascular plants? A. Seeds B. Gametophyte C. Conductive tissue D. Rhizoids

Explain what the word in in each set have in common. Wells, Dams Aquifer, water table

Which situation allows for evolution during gene duplication? A. Existing genes are copied over generations. B. The original gene performs the same role as the mutated gene. C. The original gene NEVER duplicates. D.

Are certain types of natural resources associated with specific rock types? Explain.

What size star is the sun large medium small

Why do termites live in colonies instead of individually?