Answer these questions in detail.
Answers
Explanation:
a)Earth's atmosphere is composed of about 78% nitrogen, 21% oxygen, and one percent other gases. These gases are found in layers (troposphere, stratosphere, mesosphere, thermosphere, and exosphere) defined by unique features such as temperature and pressure
b) The average productivity of the biosphere changes little from year to year, but there are small variations. Plants require four things to grow: nutrients, light, water, and moderate temperatures. When any one of these things changes, plant growth will change too.
c) The answer is tiny organisms known as cyanobacteria, or blue-green algae. These microbes conduct photosynthesis: using sunshine, water and carbon dioxide to produce carbohydrates and, yes, oxygen. ... "What it looks like is that oxygen was first produced somewhere around 2.7 billion to 2.8 billon years ago
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