the answer is b. energy and matter can enter and leave.
Answer:
Tropical Climate
Explanation:
If glossopteris fossils were found in Antarctica, the climate of this continent before was a Tropical Climate.
Answer:
Explanition:
The immune system is made up of special organs, cells and chemicals that fight infection (microbes). The main parts of the immune system are: white blood cells, antibodies, the complement system, the lymphatic system, the spleen, the thymus, and the bone marrow.