The 2010 census indicates that since 1960 Mexico’s population has more than tripled to 112.3 million. However, the growth rate between 2000 and 2010 (1.4% per year) is less than half the 3.4% rate of increase experienced in the 1960s. If Mexico’s population had continued to grow at 3.4% since 1960, it would have been over 186 million by now!
Answer:
0.37s to 2d.p
Explanation:
period T = no of oscillation/time taken
- no of oscillation is 59
- time taken=2×60+40= 120s + 40s=160s
T=59/160
T=0.37 to 2d.p
Answer:
Paleozoic
Explanation:
The Paleozoic Era is a geologic era that lasted from 541 to 251.902 million years ago. This is divided into six geologic periods: the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian. The swamps that were turned into coal over time grew during the Carboniferous period, which expands from 358.9 million years ago to 298.9 million years ago. The period is well-known because many coal beds were formed during that time period. During the Carboniferous, terrestrial animals were well-established. It ended with a minor extinction event known as the Carboniferous rainforest collapse.
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.
