what is the relationship between heart rate & respiratory rate (impact on oxygen, carbon dioxide & energy levels)

The kind of fertilization found in the majority of aquatic animals is (internal or external) fertilization.

How is the carbon cycle related to global warming ?

Which of these is an example of land degradation? a. containers designed to store pollutants leak. b. fertilizers provide too many nutrients to crops. c. garbage is buried so the land can be reclaimed later. d. a drought kills all the plants in an area, leaving bare land