If something doesn't fulfill all of the characteristics of living things, they are
considered ...
A. living
B. biotic.
C. a virus.
D. non-living.

C. Viruses

Explanation:

Viruses lack the properties of living things. They have no energy metabolism, they do not grow, they produce no waste products, and they do not respond to stimuli. They also don't reproduce independently but must replicate by invading living cells.

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c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.