Tissues are made of a grouping of cells.
a. true
b. false

The correct answer is A. True

Explanation:

Tissues are the basic structure of organs in both plants and animals. These are made of groups of specialized cells that have specific biological functions. For example, in animals muscles that support the movement are composed of muscle cells that had a specialized structure and function for this. This also applies to plants that are made of epidermal, vascular and ground tissues. According to this, it is true tissues are made of a grouping of cells as each tissue contains sets or groups of specific cells.

hydroxyl -oh

alcohols, always polar, can form hydrogen bonds with h2o molecules

carboxyl -cooh  

cargoxylic acids, has acidic properties which is a source of hydrogen ions, found in cells in ionized for with a charge of oh-1

carbonyl > co

ketone if within skeleton, aldehyde if group is at the end of skeleton, k & a may be structural isomers, it determines 2 sugars (ketose & aldose)

amino -nh2

amines, acts as a base, it can pick up h+ ions from surrounding solution, ionized with charge of 1+

methyl ch2

addition to rna/dna affects and gene expression

phosphate -opo3 ²⁻

organic phosphates, contributes to negative charge to, molecule that it is a part of, and potential to react with h20

sulfhydryl -sh

thiols, cross-linking stabilize the protein, and it is structure

i think its the first one