The answer is DNA. I am very sure of this .
Answer:
If consumers decrese, the animal that eats them will die off and the animal that eats that one will die off and so forth. Also, the plants will not be under 100% controle.
Explanation:
The answer is D. quaternary
The tetrad occurs during the first phase of meiosis. It is the foursome of chromatids that forms when replicated homologous chromosomes align. It must be formed for crossing over to occur. It is broken apart when the homologous chromosomes separate in meiosis I