Answer:
Option B, It was made in stars that lived before the solar system formed.
Explanation:
Almost all the carbon that exists today with in the living organisms was produced in the stars. When these stars exploded during the big bang theory all the carbon within hem was introduced in the environment of earth some billions of years ago. Hence , though carbon introduced in earth’s environment was due to big bang, its origin is from the stars. Hence option B is the correct answer
Cyanobacteria is responsible for generation of oxygen on planet earth and thus option D is in correct.
Answer:
No-till farming, which is the practice of leaving old stalks, provides cover from rain. The cover reduces water runoff and slows soil erosion. Contour plowing helps prevent erosion from heavy rains.
Explanation:
which is the practice of leaving old stalks, provides cover from rain. The cover reduces water runoff and slows soil erosion. Contour plowing helps prevent erosion from heavy rains.
Gradual changes in the frequency of diseases over long periods are known as SECULAR TIME TRENDS. For example, the rate of mortality in USA due to coronary heart diseases over a period of time. Onset of puberty in girls is also a secular time trend.
Secular time trend is also referred as Secular Variation and Secular Drift.
Answer:
There is a great deal of diversity in life on Earth because the planet has so many different climates that life has adapted to and colonized.
Explanation:
The plant that is grown in sunglight will thrive compared to the plant that is grown in the dark.
Sunlight helps the plant photosynthesize which is needed to keep the plant alive and growing. Without light the plant will not be able to photosynthesize and will eventually die.
