Answer:
A. Structure
Explanation:
They do most of the work in cells and are required for the structure, function, and regulation of the body's tissues and organs. Proteins are made up of hundreds or thousands of smaller units called amino acids, which are attached to one another in long chains.
C. They help with gas exchange, and the air taking up the space is lighter than the cells that could be there instead. Also, only cells can carry out photosynthesis, not air.
<span>Genotype is genetic and phenotype is environmental. An organisms genotype is total genome determines its characters. Genome is the total genes for all the characters. Its outcome is called phenotype. It is greatly influenced by the environemental factors. Same genotype may produce different phenotypes in different environments.</span>
The main purpose of biological taxonomy is to use a systematic method to name,
organize, and show relationships among species.
Taxonomy<span> (from
Ancient Greek: τάξις taxis, "arrangement", and -νομία -nomia,
"method") is the science of defining groups of biological<span> organisms on the basis of shared characteristics
and giving names to those groups.</span></span>
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