True. This is called cellular homeostasis. This happens when cells are able to produce and excrete materials within their environment to regulate processes like cellular respiration, phagocytosis, and pinocytosis. If cells are not able to do this, mutations and excessive cellular division may occur causing abnormalities in specific organisms.
Meiosis is important because it ensures that all organisms produced via sexual reproduction contain the correct number of chromosomes. Meiosis also produces genetic variation by way of the process of recombination. Meiosis is important because it produces gametes, female or male germ cells.
The radical in this question is OH.
The reason this will be a radical, is that the definition of a radical is the presence of an unpaired electron. This causes the radical to be unstable, desperately wanting to do something with the free electron that it has.
Oxygen has a charge of 2-, and Hydrogen has a charge of +1. When you pair them, you end up with a net charge of 1-, which is the presence of that unpaired electron. It will usually be written as: 
The answer is no cell wall. plant cells have cell walls and if animal cells had cell walls, we wouldn't be able to move as freely as we do.
Answer: d. all the above
Natural resources can be classified into two main types:
1.Renewable resources
2.Non-renewable resources
Renewable resources are those which can be replenished and reused. These resources are abundantly present in the nature. Example wind, biomass. Non-renewable resources are those which cannot be replenished after single time use. Example fossil fuels, groundwater, natural gases, forests. These resources needs to be conserved and their use should be judicious. Government should participate to prevent excess and destructive use of natural resources. Such as it should prevent deforestation. Many buisnesses requires the use of fossil fuels and natural gases which should be limited as these resources takes several years to be produced under the heap of earth. Citizens should prevent the use of groundwater in excess as this is the water reservoir which takes many years to be filled by natural means such as rain, agricultural irrigation, river and lakes.
