Answer: B
Explanation: That'd be based on how it's taken care of
B. an atom
Atoms are the basic units of matter and the defining structure of elements.
I think it A because Cyanobacteria absorb co2 from the atmosphere and then release oxygen To the atmosphere
Answer:
C. Recall an unsafe product
-Crossing over occurs between prophase 1 and metaphase 1 and is the process where homologous chromosomes pair up with each other and exchange different segments of their genetic material to form recombinant chromosomes. It can also happen during mitotic division, which may result in loss of heterozygosity.
