Along beaches, groins have . A. increased depositional rates immediately downcurrent from the groin B. solved the problem of beach drift C. increased erosion rates immediately downcurrent from the groin D. increased erosion rates immediately upcurrent from the groin

Which best summarizes the finding of avery? a. some traits are recessive. b. humans reproduce sexually. c. dna is a transforming factor. d. traits cannot be inherited.

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes

Which characteristics must an object possess in order to be considered alive?