Where does nitrogen come from in the ecosystem

What characteristic of Charales would enable them to survive a dry spell? sperm with flagella phragmoplasts sporopollenin chlorophyll a

Which of the following is NOT a reservoir of infection? a. a healthy person b. a sick animal a hospital c. a sick person d. None of the answers is correct; e. all of these can be reservoirs of infection.

This happens in the "presence of oxygen" and makes nearly 20 times as much ATP as glycolysis alone? Alcoholic fermentation lactic acid fermentation anaerobic respiration aerobic respiration

The human immune system uses a variety of means to defend the body from pathogens. Of the lists below, which elements are parts of the human immune system? a. skin, lymph nodes, white blood cells, and spleen b. mucous, urine, and kidneys c.

Monosaccharides are used by plants and animals as a source of a) building muscle b) hormone balance c) fat storage d) a source of energy

What is natural gas

A reaction in which products can react to re-form reactants is a. reforming b. reversible c. buffered d. impossibnle at equilibrium a. the forward reaction rate is lower than the reverse

Why is it so important to be ethical in conducting the scientific method process?

How did Mendel make crosses with his plants? A., He planted the seeds of each type together, and they grew into a single plant. B., He cut the peas in half and combined them to grow a single plant. C.

Marissa is studying the solar system. which object in the solar system is a star? A. the sun B. saturn C. Earth's moon D. a comet