About 70% of our planet is covered by oceans. compared to the depth of the solid portion of earth, the water on earth forms a
a) much thinner layer.
b) much thicker layer.
c) layer about twice as deep.
d) layer with a similar dept
deforestation affects entire ecosystems, including the organisms that live in them.
in rainforests, deforestation has devastating effects. wildlife diversity, for instance, tends to decrease as species are displaced from their natural habitats. animals go to new places in search of shelter and food. in many cases, they die of hunger or are threatened with extinction due to the spread of diseases.
deforestation also affects rivers, different streams of water and the soil. the soil, which provides essential nutrients for vegetation, is exposed to more sunlight and heavy rainfalls that erode it. erosion makes the soil drier and infertile.
many human illnesses are caused by infection with either bacteria or viruses. most bacterial diseases can be treated with antibiotics, although antibiotic-resistant strains are starting to emerge. viruses pose a challenge to the body's immune system because they hide inside cells.
b is the final : )