Answer:
unicellular life first
Explanation:
it arose billions of years ago while multicellular life forms around at least 600 million years ago
The thymus gland is the main organ of the lymphatic system. Located in the upper chest region, the primary function of this gland<span> is to promote the development of specific cells of the immune system called T lymphocytes.</span>
Definition. The hypothesis accepted to be true if the null hypothesis is rejected based on statistical evidence. Supplement. In the statistical testing of hypothesis, the two rival hypotheses are the null hypothesis and the alternative hypothesis.
Viruses depend on the host cells that they infect to reproduce. When found outside of host cells, viruses exist as a protein coat etc.
true.
