Bacteria in root nodules change nitrogen gas into what form?

Explain how pathogens are spread by coughing and sneezing. what can be done to prevent the spread of these diseases? people's choices can have a positive or negative effect on their health.

The domestication of dogs has led to a. a variety of reproductively isolated breeds. b. a variety of phenotypes. c. a variety of homologous structures. d. a variety of different species. a variety of mutations.

What observation led researchers to propose that chloroplasts evolved from cyanobacteria? Both produce proteins. Both contain mitochondria. Both provide structure to cells. Both perform photosynthesis.

What are the layers of skin?

What are the key elements of cell theory? chose all that aply A. All living things are composed of one or more eukaryotic cells. B. Cells arise only from other cells. C. The cell is the basic unit of life. D.

Which process occurs only in autotrophic organisms?

Nylon fiber is classified under which one of these headings? A. Protein B. Polyurethane C. Polyester D. Polyamide

What factors influence the growth of organisms and their ability to reproduce?

In trying to differentiate between chronic bronchitis and emphysema, you know that chronic bronchitis: 1. Usually occurs after age 50 and has insidious progressive dyspnea. 2.

The bonds formed when electrons are shared is called a (n) ? A) ionic bond B) hydrogen bond C) covalent bond