Less than 4% of the world's water is fresh water and 2/3 of it is underground
Easy. Because the tilt of the earth, and because the of the distance the earth is from the sun, either more light hits the earth, or less light hits it. This becomes the basis for winter and summer solstices. This also becomes the reason why the seasons change (as the ecosystem begins to accommodate to the changes in energy disposition)
Answer:
grams
Explanation:
Given -
Half life of the silicon-32
years
Half life means the time period required by a radioactive element to reduce its mass by half.
Radioactive decay formula is

Where
A represents the amount of radioactive element after time t years
represents the initial amount of radioactive element
time of decay
half-life of the substance
Substituting the given values in above equation, we get -

grams
Answer:
Large areas of the earth with similar climate and ecosystems are called biomes.
Explanation:
Biomes are defined as areas of the planet with common characteristics, such as animal and plant species, as well as climate, which is why it is called a bioclimatic landscape.
When a relationship is established between an ecosystem —with all its biotic and abiotic components— and the climate in a given area, reference is made to a biome. Consequently, a <u>biome represents large areas of land with similar geographical, climatic and biological conditions</u>.
The other options are not correct because:
- <u><em>Communities</em></u><em> are groups of individuals with common characteristics.
</em>
- <u><em>Populations</em></u><em> are individuals of the same species that occupy a certain space in a certain time.
</em>
- <u><em>Organisms</em></u><em> are synonymous with living beings.</em>
Answer:
It's fibers
Explanation:
Its fibers are longer than they are wide, and they are striated, like skeletal muscle fibers. But, unlike skeletal muscle fibers, cardiac muscle fibers have distinct ends to them, called intercalated discs.