Choose all the answers that apply. check all the statements that are correct. an independent variable is the variable which is changed. the dependent variable is the variable which is observed as a result of the change. disproving a hypothesis means it cannot be tested again. experiments are usually published to communicate findings to the scientific community. if data can be repeated, it cannot be trusted.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.

that is true   : ) hope this you