Stable ecosystems can be altered, either rapidly or slowly, through human activities, natural disasters, climatic changes. An ecosystem may be described as a community and its surrounding which includes non living organisms. Human activities such as deforestation, mining, dumping of wastes on the oceans alters and affects the ecosystem negatively and thus making the habitats unfavorable for the organisms. Natural disasters such as floods, tsunami and climatic changes may also alter the ecosystem.
This is really a math question. If a person is supposed to consume 8, 8 oz glasses of water in one day than you would multiply
8 x 8oz =64 oz. than 64 oz x 30 days= 1920 oz in one month
because that is a large number you might want to break it down to gallons.
1920 oz divided by 128 oz (one gallon)= 15 gallons in one month.
Osmosis of Water Across the Membrane. Osmosis is the tendency for water molecules to move from where there is a higher concentration to where there is a lower one. ... The cell membrane helps to regulate and slow down the flow of water into the cell. This is yet another way that the cell membrane helps maintain homeostasis
Answer:
C. An organism that was brought to an area by humans many centuries ago
Placenta
It also does not allow the maternal and fetal bloodstreams to mix
