Where does the primary source of energy needed for life come from?
1) solar energy
2) geothermal energy
3) nuclear energy
4) kinetic energy

Nasa scientists must work together to make sure that everything is correct and accounted for when launching a shuttle. besides a physicist, what other type of scientist would be in making sure that the shuttle has the appropriate type and amount of fuel to reach its destination?

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Black fur(b) in guinea pigs is dominant over white fur(b). find the probability of a homozygous offspring in a cross: bb x bb. a. 0% b. 25% c. 50% d. 75% e. 100%