I believe the answer is heart, liver, pituitary gland, kidneys, and skin! hope this helped :)
The digestive system breaks down the food we eat while the circulatory system transports the tiny particles to each cell in the body.
Answer and Explanation:
Humans are one of the most powerful biotic factors. Human activities have had great influence on the distribution of other organisms. The use of aerosols and industrial chemicals like chlorofluorocarbons which are residual and persistent can cause depletion of the ozone layer. This results in harmful radiations from the sun reaching the earth's surface.
Excessive production of CO2 by the industries and removal of vegetation like the trees results in the accumulation of CO2 in the lower atmosphere. This causes the greenhouse effect which results in global warming.
Radioactive emission from nuclear reactors, mine and radioactive wastes causes cancer, mutations and even death.
<span>When a farmer stops cultivating farmland and abandons
it, the growth of wild grasses and weeds can be considered secondary succession
because of the presence of the existing soil. Secondary succession occurs in ecosystem
when soil have been disturbed or disrupted by humans such in a way of farming. Furthermore, the reason why it cannot be
categorize as primary succession because primary succession only occurs in
essentially lifeless areas, where soil is not capable of sustaining life. Specifically,
this is called old-field succession where wild grasses and weeds represents a new
plant species to colonize a bare soil after the farmer abandon the farmland.</span>
