Pain does all of the following things except a. indicate potential danger in environment b. signal presence of injury in the body c. alert body to presence of disease d. warn the body about a natural disaster

The correct answer would be D. warn the body about a natural disaster

The pain refers to the unpleasant physical sensation which is associated with illness or injury.

Thus, pain has used a sign or symptom which indicates the presence of disease or illness in the body. It may also indicate the potential danger in the environment.

For example, lack of oxygen in the atmosphere, extreme cold temperature et cetera may cause pain.

However, body pain has no direct or indirect link with the presence of a natural disaster.

phylogenetic tree is the tree of life or evolution tree. it shows the different branches of evolution. the sequence goes like tissues - coelom - backbone - endoskeleton - segmentation

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