To be considered a theory must be supported by multiple sources of evidence.
a. reliable
b. valid
c. proven
d. true
e. acceptable

Which greenhouse gas is emitted when burn fossil fuels for energy? a.nitrogen b.oxygen c.carbon dioxide d.helium

Which could be a pathway of food through an ecosystem

In pea plants, yellow seed color (y) is dominant and green seed color (y) is recessive. based on the punnett squares, what are the chances that the offspring in the second generation will have green seeds?