What two layers of the egg must the sperm penetrate to reach the egg's plasma membrane?

Muscular dystrophy affects the functioning of skeletal muscle. As this disease advances, it can impair the contraction of the diaphragm and the muscles of the rib cage.

What is chemosynthesis?

Scientists that studies matter and energy and how they react

Scientists have observed that polar bears are moving farther inland and hunting and eating more birds in arctic regions.

Integrated pest management is defined by the Environmental Protection Agency as, "the coordinated use of pest and environmental information along with available pest control methods, including cultural, biological, genetic and chemical methods, to

Which autonomic system conserves energy by returning the body to a normal activity level through a lowered heart rate and blood pressure? a peripheral nervous systemb sympathetic nervous systemc somatic nervous systemd parasympathetic nervous system

The science of heredity

At which age range does the most intensive myelination of nerve cells occur?

The role of the excretory system is to rid the body of toxic waste products. Which of the following body systems also plays a direct role in removing waste products from the body? A) endocrine B) nervous C) respiratory D) skeletal

What supplement might be recommended by the food and nutrition board?