Index fossils help scientists estimate the age of a rock because index fossil species only existed for a relatively short time. What happened to
the species have are now used as index fossils? *
A. They became extinct.
B. They changed their diets.
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C. They hid in marine sediments.
D. They migrated of new environment

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