To correctly classify a rock as igneous, sedimentary, or metamorphic, what would a geologist need to know?

a.
color of the rock

b.
the hardness of the rock

c.
how the rock formed

d.
how the rock breaks apart

In the respiration-photosynthesis cycle shown above, what are the products of cellular respiration that belong in box 2?

Tropical rain forests support more species per unit area than any other terrestrial ecosystem. what is one way rain forests are important to the health of the biosphere?

Read the scenario below and answer the question that follows. hallie is reading a novel in the library when susan, her best friend, slumps down in a chair next to her. susan doesn't say anything, but hallie knows that susan is upset because she is slumping in her seat and rolling her eyes. a psychologist would explain that hallie is interpreting her friend's emotion based on a. the behavioral component of emotion b. her friend's ability to regulate emotion c. the verbal component of emotion d. the physiological component of emotion select the best answer from the choices provided a b c d