Amino acids. Every protein is a long chain of amino acids.
<span>The correct answer is the source of segregation.
Source of segregation of a complex acoustic signal into separate auditory events. Some sounds which come from different sources, they can be localized by the human brain to where the sound is coming from.
Based on loud of the sound it will be easy for a person to detect where the sound is coming from.</span>
I believe your answer would be Echinoderms and Chordates. I hope this helps!
Crossing over occurs at the four-strand stage when two homologous chromosomes, each consisting of a pair of sister chromatids, are paired. Each crossover involves just two of the four strands and generates two recombinant strands.
Hope this helps!