Which of the following are not clues that a chemical reaction has taken place?
a. steam
b. formation of a gas
c. change in color
d. constant temperature

Which of the following protists gets nutrients mainly by absorbing molecules from other organisms through their cell walls and cell membranes? a. amoebas b. water molds c. ciliates d. slime molds

Where do the respiratory and circulatory systems meet? a. in the heart b. in the muscles c. in the lungs d. in the brain

Aflame cell is at the end of each tubule of the nephridium malpighian tubules kidneys none of the above