How does carbon dioxide enter the atmosphere?
1. Animal respiration
2. Pollution - combustion
3. Dead animals decomposition
4. Dead plants
5. All of the above

How are proteins and nucleic acids related? they both provide energy. they both carry genetic information. the structure of proteins is determined by nucleic acids. the subunits of nucleic acids are also the subunits of proteins.

In the practice of science, this type of reasoning is used to develop explanations.

Temperatures in ponds and lakes vary by season. select the best answer from the choices provided t f