What components makes up the backbone of dna?
a
adenine & guanine
b
cytosine & thymine
c
phosphate & sugar
d
nitrogen base & sugar

Legumes, a type of plant, require rhizobia, a type of soil bacteria, to survive since these organisms fix nitrogen during photosynthesis. rhizobia use the legumes for food. what would most likely happen to the legume population if rhizobia suddenly became extinct?

Which is an important function of normal flora? a. aid with bone marrow production. b. crowd out pathogenic bacteria. c. destroy digestive track pathogens. d. manufacture iron in the bloodstream.

What if the yeast were extremely active and produced more than 100ml gas. would you know? why/why not