If an object on Mars weighs 45 N and the acceleration due to gravity on Mars is 3.8 m/s2 2
, what is the mass of the object?

What percentage of light hits earth's surface directly?

Several bird species feed in a certain species of tree. each bird species feeds in a different part of the tree. which statement is true of these bird species? a. they have adapted to different niches due to competition b. they have a carnivorous relationship with the tree species. c. they have adapted to different niches due to predation d. they have a symbiotic relationship with the tree species.

Reproduction of plants differs from reproduction of animals in that