Which of the following is NOT used to classify organisms based on evolutionary
relationships?
Learned Traits
Fossil Records
Amino Acid
Sequence
DNA Sequence

fossil records

Explanation:it has nothing to do with Evolution

A Typical Antibody Has Two Identical Antigen-Binding Sites

The simplest antibodies are Y-shaped molecules with two identical antigen-binding sites, one at the tip of each arm of the Y (Figure 24-18). Because of their two antigen-binding sites, they are described as bivalent.

For this reason, most of what we know about the B-cell receptor comes from the study of antibodies. Antibody molecules are roughly Y-shaped molecules consisting of three equal-sized portions, loosely connected by a flexible tether.

Explanation:

CarryOnLerning

MarkAsBrainliest