Some people have attached ear lobes and some people have free ear lobes. the differences in these traits are caused by a. differences in personality. b. differences in genes. c. differences in diet. d. differences in environment.

Lucia is walking barefoot in her yard. she accidentally steps on a nail. how will her nervous system work to generate a reaction? arrange the eventschronologically.

Which short-term environmental changes would a very small asteroid or comet impact on earth most likely cause? check all that apply. flooding extinction craters on surface changes in weather patterns death of organisms and populations

Matched chromosomes carrying information about the same characteristics in the organism are called