What are some examples of organs and tissues where mitosis occurs regularly? what are some of the tissues where mitosis is practically absent? why the discrepancy?

There are many organs in our body. Some examples for organs are heart, brain, lungs, kidneys, stomach, liver, pancreas,  oesophagus , intestine, sense organs like eyes, ears, skin, tongue, nose.  

There are four main types of tissue: muscle, epithelial, connective and nervous. Each is made of specialized cells that are grouped together according to structure and function. Muscle is found throughout the body and even includes organs such as the heart. Our outer layer of skin is epithelial tissue

.Actually the greatest mitosis occurs in the epithelium. Epithelium can include the lining of your GI or even the skin. For example, the skin is the largest organ in the human body and almost all of it is exposed to the environment, which makes it more susceptible to rubs, aberrations, and wounds. The skin has to replenish this by making more skin cells at a higher rate.  

The slowest mitosis occurs in the nervous system. Nerve cells almost never multiply which is why it is difficult to heal once you have an injury involving the Nervous system.

Generally, in vertebrates, mitosis is more frequent in tissues that require frequent renewal due to their function, such as epithelial tissues and bone marrow.  In some adult tissues, mitosis is almost absent, such as in the nervous tissue and striated muscle tissue (skeletal and cardiac).

the two answers are a, the population of birds with large beaks will increase on the island, and c, the trait for large beaks will be passed on to future generations through natural selection. the reason for that is because if the birds that have beaks developed for eating small seeds lose all of their food, they will go hungry and eventually starve because they physically cannot eat the large seeds, therefore making the population of large beaked birds higher. also, if the trait of large beaks are dominant on the island over small beaks, then over time the large beaked birds will reproduce more and more, while the smaller beaked birds will reproduce less and less because they can't survive with the food provided. that leads to the trait of small beaks disappearing and the trait of large beaks taking over the island.

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