The main difference between the gravitational force and electrical force is that 1. Gravitational force can only push
2. Gravitational force can pull and push
3. Electrical force can only pull
4. Electrical force can pull and push

The large increase in atmospheric carbon dioxide in the last 50 years most likely comes from a. an increase in cellular respiration b. increased decomposition by bacteria c. an increase in the burning of fossil fuels d. an increase in photosynthesis

When rutherford performed his metal foil experiment, he was surprised that most of the alpha particles

How do all types of diffusion/passive transport actually ‘work’ without using even the smallest amount of cellular energy?