The answer is C) A fern
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it's autotrophs.
They are the primary producers.
Answer:
Option (D)
Explanation:
The existence of a good and favorable ecosystem depends upon certain factors such as temperature, rainfall, and sunlight. In a place where there is abundant rainfall, sunlight and moderate temperature, there occurs an ecosystem that is rich in a variety of species as it provides the necessary elements that support the existence of a favorable ecosystem. Due to the moderate temperature and good amount of precipitation, the soil in this ecosystem gets the required nutrients that help in the growth of different species of plants and trees. This given condition reflects a tropical type of ecosystem where there are numerous trees and also a huge variety of species exists. The tropical ecosystem lies in the equatorial and near-equatorial region on earth.
Hence, the correct answer is option (D).
Answer:
scientists have developed four different methods of determining the age of the earth. By using these methods, or a combination of them, the age of geological formations created by past events and even the fossilized bones of prehistoric animals can be determined.
Based on the research done by scientists, the Geologic Column, a graph that illustrates earth age, was developed. The Column, with its names for the epochs and eras of time, illustrates what scientists think was taking place in earth history. The three primary methods are:
Radiation Measurement
Stratigraphic Superposition
The Fossil Record
From these methods of dating, scientists have determined that the earth as we know it seems to be about 4.6 billion years old. It is theorized that the earth got its start as a result of what is called the "Big Bang nearly 6 billion years ago. The Big Bang theory holds that all the planets, stars, solar systems, galaxies, etc., are the result of a huge explosion that sent material speeding through space. As time passed, the gravitational force of larger chucks of material attracted the smaller chunks and formed the galaxies and solar systems we see today.
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Answer: Free-floating DNA is a term used to describe Prokaryotic DNA because such cells do not contain a distinct nucleus complete with a nuclear membrane. Such DNA simply exist in a region in the cytoplasm called nucleoid. Nucleoid is not distinct but can be found in any part of the cytoplasm, thus the term 'free-floating'.
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