An NFL quarterback threw a football from the 50 yard line to the end zone (50 yards) it took 4.5 seconds to get to his receiver. How fast did the quarterback throw the ball?

Which statement best describes a keystone species? o a. it has littlelmenetic variation. it has an extremely high population. 0 b. 0 c. it remains unaffected by all environmental changes. od. it has a strong influence on the ecosystem. 0 e. it's the first species to populate a new ecosystem.

How many chromosomes are in a gold fish?

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi