Which of the following choices contains two ways in which carbon enters the atmosphere? A. Erosion and transpiration
B. Volcanic Activity and Photosynthesis
C. Human Activity and Nitrogen-Fixing Bacteria
D. Emissions from Factories and Respiration

If water were a non polar molecule, how would its properties be different ? a.) water would be a much lighter molecule b.) water would be able to climb up inside plants c.)water would not be able to form hydrogen bonds d.) water would stick together much more strongly

The response is the basis for vaccination. primary secondary tertiary none of the above

Explain why the plants cortex would serve as the best food source for animals