What level of organization is formed when many cells come together ?

A (Tissue)

Explanation:

Cells are the simplest level of organization. Many cells working together form tissue. The cells involved are specialized to cooperate with each other to accomplish one common goal. There are many different types of tissue in both plants and animals. When there are layers of tissue working together, they form an organ.

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Its tissue

Explanation:

when it comes to the levels of organization cells come first the tissue

the answer is c.) there is a warm front in region a and a stationary front in region b.

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products