The sun reaches its highest point in the Northern sky (North of the equator) on the: A. Summer solstice
B. Winter solstice
C. Vernal Equinox
D. Autumnal Equinox

What are the student's observations and inferences before he starts his investigation?

Vaccines are weakened forms of disease causing microorganisms, which are given to patients to prevent disease. after the vaccine is administered, the immune system responds by creating a(n) to recognize the a.) antibody, antibiotic b.) antigen, antibody c.)antibiotic, antibody d.)antibody, antigen

How energy move through ecosystem ?