Q: when no exernal forces are acting on a group of objects, their total momentum does not change

answer choices:
a) law of conservation of energy
b) law of conservation of matter
c) law of conservation of mass
d) law of conservation of moment

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?

As a small change in a person's dna can cause a genetic disorder

Areal dna molecule consists of thousands of these pairs of nucleotides. what is the pairing arrangement of the nitrogen bases