They are much like empty rooms false
the cell lacks a nucleus is true
the rest are wrong
Evan is a substance produced by a living organism which acts as a chemical symbol en
Explanation:
enzyme is produce by a living organism which acts as a catalyst to bring about a specific biochemical chemistry
Answer:
The circulatory system carries oxygen, nutrients, and hormones to cells, and removes waste products, like carbon dioxide.
Explanation:
hope this helps
All choices correctly describes physical barriers. Physical barriers after composed of tight junctions wherein it is difficult for the bacteria and viruses to penetrate. Examples of these physical barriers are the skin and the mucous membranes and these work in conjunction with secretions like tears and mucus (as tears and mucus contain IgA, a special type of immunoglobulin that is secreted to fight harmful organisms).
