Chickens eat small rocks for what reason?
a) they lack teeth, so this aids with digestion.
b) they will eat anything that is put in front of them.
c) they are the only available source of minerals.
d) past cultures have used them to clear land.

Which phrase is the best summary of the model shown? a. the transfer of the sun's energy through trophic levels b. a series of aerobic and anaerobic reactions c. a transformation of light energy into chemical energy d. the breakdown of food molecules

Is dna the same in every cell in the human body explain your answer

Which statements explains what the fossil records indicates? check all that apply. a) earth is 4.5 billion years old b) many organisms have become extinct c) mammals have always existed on earth d) mass extinctions have occurred several times on earth e) the amount of water on earth has decreased over time?