I would go with C) food because food gives us energy, healthy veggies gives us energy and unhealthy junk food really doesn't give us as much energy and makes us fat. Not air because air is the need for life, not energy and not a place to live since that really doesn't give us energy.
Answer:
a
Explanation:
Cells are the functional units of life, this means that all living organisms are made up of cells. In multicellular organisms, cells are organized into complex structures such as tissues, organs and systems. A tissue is made up of similar cells which have the similar function. An organ is made up of several tissues while a system is made up of related organs. Example of a tissue is blood which is made up of similar cells such as red blood cells and white blood cells.
Answer:
Specialization can be described as a process by which each cell of the body tends to specialize and perform a certain important function for the body.
Although, cells of the body might have a different structure and function, yet they all carry the same chromosomes and the same DNA. However, the expression of genes is what controls the functioning of each cell. The genes which might be expressed in one cell might be repressed in the other type of cell. Hence, this is the differentiation process which allows each cell to perform a unique function.
I would say B) 1-3 hours because Bacteria can multiply anywhere between 20 to 30 minutes and if it doubled in size 1-3 hours would be the most reasonable option!
