What is a biotic factor in a coral reef ecosystem?

A) dissolved oxygen in water

B) lion fish

C) level of the tide

D) level of salinity

Which is bigger molecule or atom

What does the center of the DNA strand exhibit?

When technological advancement was necessary before scientists could begin to observe cells

The skeletal muscle complex known as the triad consists of A) actin, myosin, and filaments. B) a terminal cisternae and two transverse tubule. C) filaments, myofibrils, and sarcomeres. D) A bands, H bands, and I bands. E) None of the above.

Acid + base yields salt + water is an example of a (n): -synthesis reaction -exchange reaction -decomposition reaction -reversible reaction

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?