Behind the first whisker in boys and the widening of hips in girls is a flood of powerful chemical substances secreted by the endocrine glands and carried through the body by the bloodstream. a. amino acids b. lipids c. proteins d. hormones

Which of the following is not considered an appendage of the skin? nails glands follicles none of the above

45 points how are people today being protected from tsunamis? earthquake data is analyzed to detemrine if a tsunami is likely, and if so, warnings are sent out. areas in tsunami risk zones are no longer heavily populated. radar is used to measure wave heights regularly. meteorologists study the winds to determine if wave heights will be large.

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