Directions: On the line before each statement, write T if the statement is true or F if the
statement is false.
8. Most bacteria are harmful.
9. Foods, such as yogurt and cheese, are made with the help of archaea.
10. Some bacteria make you sick by damaging tissue.
11. When bacteria develop resistance, antibiotics become more effective.

co2reflects heat radiation back to earth buning coal and oil emits co2 globe warms

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.