Which tool is a lever? a. a doorknob b. a knife c. a screw d. a shovel

Aperson travels 35 km in 0.4hrs, followed by 53 km in 0.6 hr. what is the average speed

Freckles are a dominant trait in humans. both of the girls have the genotype ff for freckles. if either one marries a man with no freckles, what are the chances that their children will have freckles?

How are primary producers important to the alligator's energy supply