Which of the following is an example of a compound machine? explain why.

a. seesaw

b. crowbar

c. your body

Number and variety of living organisms includes genetic, species, and ecological types

Suppose you use three different scale to weigh a bag of organges. one scale says the nag weighs 2.1 lb, and third says it weighs 2.1 lb. the actual weight of the bag of organges is 2.153 lb. which of the following best decribes these results?

26 a medida que cambia el clima, ¿qué tipo de reproducción más probablemente de a una especie mayores posibilidades de supervivencia?