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.
Schwann - In 1839, he cells are the basic unit of animal structure
Schlieden - In 1838, he discovered cells are the basic unit of plant structure
Hope this helps
The answer is A- sperm and egg. gametes are reproductive cells in mammals, so sperm and egg would be the correct.
The effect of a neurotransmitter is based on the properties of the receptor more than the neurotransmitter.
Answer:
the correct answer would be
A. atoms, molecules, cells, tissues, organs
