What is the name of a classification key in which there are always two choices

What regulations does the United States national environmental policy act lay down?

Dandruff is caused by the shedding of excess cells from the outer layer of the skin

A blood vessel one cell thick for absorption of nutrients and removal of wastes isa. a vein. b. an artery. c. a capillary. d. the pulmonary artery.

A skin graft is a type of surgery that transplants skin. Based on this information, which type of tissue do skin grafts aim to repair? A) nervous B) Epithelial C) Connective D) Cardiac

What is a group of ducklings called

Neurotransmitters are secreted into a specialized junction known as the: (a) Synapse (b) Synaptic vesicles (c) Ligand channel (d) Axon

Birch bolete is a fungus that normally grows on the roots of birch trees in New York State. During the life of the fungus and the birch, each organism receives nutrients from the various biochemical processes of the other.

Failure of your immune cells to recognize MHC proteins on your normal body cells might result in which type of condition? Select one: a. Leukemia b. Auto-immune diseases c. HIV d. Cancer

The purpose of the Human Genome Project was to: a. map the nucleotide sequence and identify the genes on each human chromosome. b. identify spontaneous alterations in genetic material caused by teratogens. c.

Which of the following does not belong together? A. endothelium B. mesothelium C. membrane capsule D. serous membrane E. all of the above belong grouped together