The correct answer is - cyanobacteria.
The atmospheric oxygen came from the cyanobacteria. These were one of the earliest living organisms on Earth. The cyanobacteria was using photosynthesis in order to create its own food. The photosynthesis process requires sunlight, carbon dioxide, water, and oxygen. The oxygen is mostly released as a waste product from the process of photosynthesis, thus the cyanobacteria were literally releasing oxygen that was ending up into the atmosphere. As more and more cyanobacteria there were across the planet, more and more oxygen they were releasing into the atmosphere, slowly changing the composition of the atmosphere, and setting the basis of it as we know it now.
Answer:
- Learning about, using, and understanding these pyramids is an ... sides, age on the y-axis, and the percentage of population on the x-axis. ... Rather, it displays percentages and shows what portion of people fall ... The more a graph looks like a pyramid, the faster that population is growing; old generations ...
Explanation:
Answer:
The factor that plays a signficant role in the shifting of both voting patterns and district boundaries is population.
Explanation:
In the United States, district boundaries and voting patterns are largely dependent on population. This is one reason why the national census carried out in the United States every 10 years is so important. The information from the Census is used to delegate federal money for government programs, it is used by the Department of Education for school district information, and it is also the basis for drawing up congressional district boundaries and for assessing voting patterns. In most states, the district boundaries are decided by the state legislature and both chambers have to approve the boundary plans in the majority. In some states, the governor has the power to veto this decision, but in others, he does not. In recent years there have been criticisms of this system because it can be subject to political manipulation where through gerrymandering a party tries to divide up a district, for example. This happens when say a poor neighborhood that wants to vote Democrat is split between two neighborhoods that vote Republican so that the Republican wins both seats more easily.
A green card doesn't have anything to do with citizenship, but is important if you want to stay here for a long time without committing to a citizenship. If you are ready, take the citizenship test. If not then get a visa or green card and take a course to become a citizen.
Answer:
Step 1
Explanation:
Rocks that forms metamorphic rocks are not pushed to the earth surface. On the surface, the pressure and temperature conditions are not high enough to cause any metamorphic transformation in a rock.
Rocks must subside into deeper levels of the crust where mineral changes occur and hence new rocks called metamorphic rocks.
