Answer:
Basically land pollution is caused due to urbanization, mining, industrialization, landfill and improper waste disposal of agricultural chemicals . Major chemicals responsible are pesticides, lead, heavy metals, petroleum hydrocarbon etc.
Explanation:
Mining:
This creates large holes in the ground which in a long run causes soil erosion. Mining also removes the topsoil making teh soil barren land.It also releases harmful chemicals that contaminates the air and soil.
Industrialization:
The waste from the industry contains heavy metals in it. Which pollutes the urban soil as well as the cropland. Among all lead is most toxic that causes major part of land pollution.Also the chemicals makes the land infertile for making cultivation in it.
fats, oils, waxes made of C,H,O
EX: triglycerides, phospholipids, steroids, waxes <span>uses: long term energy storage </span>
structure of cell membrane
insulation
protects organs
more efficient energy storage than carbohydrates
<span>lipids are </span>non-polar
Monosaccharides -Simple sugars
Mass Extinction might occur if an environment changes suddenly.
<u>Explanation:</u>
An extinction event reflects a broad and accelerated reduction in Earth's biodiversity. Such an occurrence is characterized by a significant shift in multicellular species diversity and availability. It happens as the extinction rate hikes about the speciation rate. Since much of the Earth's diversity and biomass is microbial and therefore hard to quantify, reported extinction events impact the biosphere's readily detected, biologically complex portion instead of the total diversity and richness of existence. These all variations results from environmental changes like temperature, pressure, habitat changing, etc.
DNA BASE PAIRS:
adenine & thymine
cytosine & guanine
those are the pairs that go together
A cell spends 10-20% of its time in Mitosis.
If this is wrong...sorry :)