At the moment of sperm penetration, human eggs _____.

Birds reptiles and mammals are called amniotes because _____

During gastrulation in frogs, a rod of mesoderm under the dorsal surface forms the _____.

In the five-kingdom system, prokaryotes are placed in the kingdom _____.

The domain eukarya contain(s) ______ kingdom(s).

The mesoderm gives rise to _____

Anaerobic glycolysis is an energy system that uses ____.

Muscle cells store enough atp and phosphocreatine for about __________ of exercise.

Within the brain, ____________ receive, integrate, and generate messages.

The _______ are the key supply source of energy for neurons.

Stimulus to the muscle spindle elicits the ________ reflex.