Answer:
3. B, D
Explanation:
A primary source is an animal that eats only plants. (herbivore) A secondary source is an animal that only eats herbivores (carnivores)
B has birds; which are food for carnivores, and fruits, nuts, and blossoms; which are food for herbivores.
D has vegetables and grains; which are food for herbivores, and meat; which is food for carnivores
The other options have only food for carnivores, or only food for herbivores, so the answer is 3
Reflections and absorption by the atmosphere prevent some radiation from reaching Earth's surface.
Sediment; There is a source of heat that was not included in the question to create all the other choices.
Photosynthesis contributes to plant growth by B. taking in carbon dioxide and making sugars (carbohydrates)
