Bc they create raw materials which converts directly to energy
The answer to this question would be the last one, tissue.
These specialized cells group together to form a common function which then becomes a tissue. These tissues then group together and form an organ. Organs then form together a system and systems form together an organism. These organisms gather and form a community and eventually into an ecosystem. This is typically a process as to how cells become organisms and how organism make up the ecosystem. Cells are the basic unit of life. Without them, there would be nothing at all.
Typical chemical formula for beta d galactose is 
with a double bond to oxygen at the <u>1st</u> carbon in the fisher projection.
A stereo formula can be represented in two dimensions using Fischer projection and Fischer projection formula despite losing the stereochemical information, including absolute configuration, near chiral centers.
Galactose lies in the D- configuration if the hydroxyl group (-OH) in carbon 5 appears on the right side with the Fischer projection. Galactose becomes L-sugar whenever the hydroxyl group of carbon 5 occurs on the left side with the Fischer projection.
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The cells had too much carbon dioxide, so they used aerobic respiration as a source of energy.
