<span>peristalsis is the involuntary, progressive, rhythmic contraction of the muscle in the wall if the esophagus propelling a ball of food down toward the stomach</span>
Answer:
Movement of plates bring changes in the physical features of the earth surface in the following ways.
1) When the earth plates move, formation of ocean occurs.
2) Continents are also the product of plates movement. Earthquake is also caused by plates movement inside the earth.
3) Mountain also formed due to the movement of plates. Volcanic eruptions also occurs due to plates.
C.Stimulation of thoracic or lumbar spinal regions,chain ganglion,acetylcholine release
Epithelial tissue <span>covers the body surface and forms the lining for most internal cavities. </span>
Answer:
There are several environmental factors that causes changes in the ecosystem and the population of that area such as invasive species, extreme weather, land use change, pollution and disease.
Lets take invasive species as environmental factor. Introduction of invasive species can cause a huge change in the ecosystem and affects the native population in that area. it increases the competition for food resources and decreases the survival rate of their preys.
For example: Water hyacinth (Eichhornia crassipes). It is an invasive plant species that has very bad impact of native population as well as other population, like it reduces biological diversity, oxygen loss, decreased phytoplankton productivity, eliminate plants that animals use for nesting, and alter animal communities by blocking access to the water.
Thus invasive population can affect population by reducing biodiversity, water shortages, decreasing availability and quality of key natural resources, disturb the food chain and can cause natural calamities.
Invasive species affect the resources that native species are using and that decreases the carrying capacity of the native population as it disturbs the whole food chain.
