Which of the following might you study in an ecology class?
habitats food webs trophic levels all of the above

How much force must a locomotive exert on a 12840-kg boxcar to make it accelerate forward at 0.490 m/s2?

Transfer chemicals from one location to another to weather objects. a-water b-physical weathering c-chemical weathering

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.