In the beginning of of platelet plug formation, the chemical produced by endothelial cells at the site of injury is called .

When should a bar graph be used? a. when there is no independent variable. b. when the independent variable is continuous and does not show a relationship to the dependent variable. c. when the independent variable is continuous and shows a causal link to the dependent variable. d. when the independent variable is composed of categories and does not show a relationship.

According to your text, should be in the native language of the parents or guardians whenever possible. a. an email b. consent forms c. oral approval d. storybooks loaned out

Which of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs