A track team wanted to test out new NikeSpeed running shoes that claim to make them run faster than their regular Nike shoes. If they wanted to test these shoes, what would be
her:
1. Independent variable:
2. Dependent Variable:
3. TWO controlled variables:
4. Control Group:
5. Experimental Group:

The observations of hooke and van leeuwenhoek documenting the existence of microscopic cells formed the basis of what important theory? a. the cell theory stating that all living things are composed of cellsb. the theory of spontaneous generation, which held that life forms could arise spontaneouslyc. the theory of chemotherapy, or use of antimicrobials to destroy pathogenic organismsd. the germ theory of disease and causative agents

Which best compares habitat and niche? o niche is a place in which organisms live, and habitat is the way in which an organism fits into its habitat. o habitat is a place in which organisms live, and niche is the way in which an organism fits into its habitat. habitat is a group of organisms that live in an area, and niche is a specific species that lives in that areao niche is a group of organisms that live in an area, and habitat is a specific species that lives in that area.

Which of the following explains why a tree is often used as a model to represent the principle of common descent