I'll say C, Science cannot answer difficult question...let me know.
Answer: Possession of Valves
Explanation: Veins possess valves which ensures that blood flows in only one direction. Valves helps blood to flow back to the heart against gravitational force.
Arteries don't have valves because the pressure originating from the heart is capable of causing the blood to flow in one direction.
The answer is codon. The genetic code is redundant as there are multiple codons are make the same protein. The codon table is 64 variants of 3 letter nucleotides that make 20 different proteins. 3 of the 64 codons make 1 stop codon (AUG -Met) and 3 stop codons.
Answer:
- <u> It is harmful because it obviously affects the plant’s ability to survive</u>
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Explanation:
Mutations are alterations in the genetic code that may occur due to environmental or chemical mutagens. Mutagens, are substances or agents that induce changes in the genetic code.
Photosynthesis is a complex biochemical process; plants convert solar energy into chemical energy as sugars like the polysaccharide glucose. They also use inorganic carbon from 
along with 
.
Plants photosynthesize in their leaves- these organs contain tissues for intake, along with the chloroplasts and mitochondria, the sites of photosynthesis and respiration. If the number of leaves are reduced, this reduces the amount of tissue capable of carrying out this essential process, limiting the plant's chance for meeting its energetic needs, and thus survival.
