B. Direction: Enumerate five (5) characteristics of a healthy school and community environment.. 11.
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Natural selection changes allele frequencies because some survive and reproduce more successfully than others.

What are some of the immune functions of the lymphatic system? a. cleaning red blood cells from the blood and creating lymph fluids b.transporting lymph to the tissues and creating lymph fluids c.removing infectious agents and making white blood cells d.making red blood cells and removing infectious agents

Si units are the modern form of the