is treatment by replacing diseased bone marrow with healthy stem cells that grow into new bone marrow. a) chemotherapy
b) stem cell transplant
c) pneumatic compression
d) radiation

Which statement describes an endocrine function rather than an exocrine function? a. salivary glands release saliva into the mouth. b. sweat glands release sweat onto the skin c. the pineal gland releases melatonin into the blood. d. esophageal glands release mucus into the esophagus.

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

The diagram shows the layers of earth. convection currents in which region influence the movement of tectonic plates