Answer:
Mechanical barriers — which include the skin , mucous membranes , and fluids such as tears and urine — physically block pathogens from entering the body. Chemical barriers — such as enzymes in sweat , saliva , and semen — kill pathogens on body surfaces.
The Outer core is liquid and moving.
Earth's core is composed of Iron and Nickel.
Answer:
Codons are
3
base "words" that code for specific amino acids. They are
nonoverlapping
and never
have gaps between
the words.
Explanation:
Answer: Phagocytosis
Explanation:
Phagocytosis is the ingestion of cells or particles as a defence mechanism when white blood cells (macrophages) engulf foreign matter such as bacteria and viruses or as part of a digestion process in free-living cells such as amoeba.
