Which of the following represents a chemical change?

a. mowing of grass
b. sublimation of ice
c. dissolving sugar in water
d. charring of a marshmallow

Which best summarizes the finding of avery? a. some traits are recessive. b. humans reproduce sexually. c. dna is a transforming factor. d. traits cannot be inherited.

Many organs are involved in the processes of keeping the blood and the body clean. when poisonous or harmful substances are in the blood, they are absorbed by the and released in a less harmful form. when wastes are present in the blood, they are filtered out and removed from the body by the

The negative impacts of nonnative species generally outweigh the positive impacts