<span>Muscle cells and nerve cells (neurons) are two very different types of cells. While nerve cells are involved in the transmission of neural synapses (hence the name), myocytes contract to move the skeletal bones and move the body. Muscle cells can be smooth (visceral), cardiac, or skeletal.</span><span>Oct</span>
A cell maintaining internal balance is called Homeostasis. Homeostasis means that everything is functioning properly and without outside help.
The correct answer is - D. A drought kills all the plants in an area, leaving bare land.
If there's such a big drought that will manage to kill off all the vegetation in an area and leave bare land behind it, than the land will be degraded in no time. Once the land is left without its natural protection that the roots of the vegetation provide, the land will be exposed to high rates of and erosion. The erosion will be very quick and the top layers of the soil will be moved away with every wind and rainfall that will appear. That will degrade the land to a very high degree, making it totally unusable and it will need lot of time to eventually recuperate.
It was pollution from the industrial revolution that caused tree trunks to turn from light to dark in color.
This process is called evolution.
The scientific theory of evolution was firstly proposed by the English naturalist and biologist Charles Darwin. Observations on the change of heritable characteristics from one generation to the next led to the introduction of the term evolution. According to Charles Darwin, evolution happens by natural selection.