Which is an external stimulus?

A thirst

B heat

C pain

D hunger

What are the challenges surrounding genetics, heredity, and inheritance?

Identify three similarities and three differences comparing the tundra to the following enviroments: the marine, freshwater and surrounding area, desert, rainforest, prairie, and swamp.

In which plants' life cycle does double fertilization occur? a. seedless plants b. nonvascular plants c. gymnosperm plants d. angiosperm plants

What effect would a drop in the size of the krill population have on the antarctic food web and why?

Which two atoms form a covalent bond? A. A sodium and chlorine atom B. Two sodium atoms C. Two oxygen atoms D. An iron and oxygen atom

The two most important regulatory systems for the maintenance of homeostasis are Circulatory and nervous Endocrine and circulatory Lymphatic and circulatory Nervous and endocrine

Difference male and female reproductive system anatomy

What will most likely happen to a healthy male who has an excess of testosterone

A woman reports to the emergency room in january with her cyanotic (blue-colored) 10-month-old child. the mother reports that the infant has had a runny nose, fever, and slight cough for a day and has had increasing trouble breathing.

What type of virus is HIV?