Amebas are single-celled organisms that need to obtain food in order to A. release oxygen into the air
B. protect themselves from other living
things
C. get the energy they need to carry
out life functions
D. remove harmful chemicals from the
environment

How do you date a sample of rock that you suspect as being one of the earliest on earth

Which sentence best describes the relationship between chlorophyll and the chloroplast? a.) chlorophyll is a chemical found in a chloroplast. b.) chloroplast is a chemical found in a chlorophyll. c.) both chlorophyll and chloroplasts are found in animals. d.) both chlorophyll and chloroplasts make carbon dioxide.

One important development during the 3rd trimester that will insulate the infant against changes in temperature is a. the deposition of fat under the skin b. the closing of the septum between c. the atria of the heart d. the beginnings of lung functioning e. the beginnings of light and sound sensing