<u>ANSWER:</u>
Scientists are now of the opinion that life originated from inorganic molecules.
<u>EXPLANATION:</u>
- Scientists now think that "life on earth" originated around 3.5 to 3.9 million years ago.
- According to scientists, "building blocks of life"(amino acids) were first formed and these combined to form the compounds essentially needed for life on earth.
- There are many scientists who also think that the first organic molecules on earth came from meteorites.
- There are however many scientists who also think that some of the "building blocks of life" may have been formed abiotically on earth.
<span>Biological scientists are research scientists who examine how living organisms relate to the environment. They can specialize in any number of plant, animal or environmental studies. Biological scientists most often have earned a master's or doctoral degree in their specialization; such degrees offer the opportunity to develop research while finishing their education. Some low-level positions related to biological science are available to those holding baccalaureate degrees.</span>
If these animals are found in a river, it shows that the river is clean. However, some animals are adapted for surviving in polluted conditions and can survive in low oxygen concentrations. Examples are blood worms and sludge worms. The presence of these species indicates there is a high level of water pollution.
