a. cows' teeth never stop growing b. cow's teeth get replaced about every two years c. only the bottom jaw has front teeth
a. the sea bottom rises more quickly along the west coast; that makes bigger waves b. there are more violent storms over the Pacific Ocean; that makes the waves bigger c. the wind direction is more often toward the shore along the west coast; that makes the waves bigger
a. the weight of the overlying rock causes pressure that makes heat b. radioactive minerals heat the earth's center c. the heat is from when the earth was formed d. chemical reactions produce the heat e. a, b and c
a. grasshopper b. kangeroo c. rabbit d. flea
a. hitches a ride on larger fish b. squirts water to jet propel itself c. shoots out its tongue and the cuttlefish is pulled forward as the tongue is brought back in d. uses a sail-like membrane to let the current drag it along
a. zero b. one million c. 1/4 d. a and b e. a and c
a. armadillo b. llama c. sheep d. hedgehog
a. coffee b. rootbeer c. Coca cola d. tomato juice
a. soapstone b. coral c. slag d. pumice
a. the entire trunk increases in size b. only a very thin layer just under the bark expands to increase the size of the tree's trunk