One primary advantage of light microscopy over electron microscopy is that ________.

Our current ecological footprint __________.

The embryonic precursor to the human spinal cord is the _____.

Paleontologists organize fossils of related species based on their __________________ similarities.

Phylogenetic trees can always be regarded as ________ about evolutionary relationships.

Organisms that possess homologous structures probably __________.

Reinforcement is the _______ in a relationship

Recent research indicates that the variation in solar output ________.

Principles of ____ must be applied to break the cycle of infection.

Population density is calculated by _______.

Plasma cells ________.