Why do scientists believe that the first organisms on Earth were extremophiles?

Select all the correct answers. A biologist came across a fungus on a beach. Upon further study, he found out that the fungus could feed on dead matter. It can also feed on living matter, but it harms the organisms in the process.

All of the following statements about neutrons are true except A. Neutrons have a mass of 1 AMU. B. Neutrons carry a positive charge. C. Neutrons carry no charge. D. Neutrons are found in the nucleus of an atom

What is the difference between the oxygen we breathe and the ozone located in the earth's stratosphere?

Scientists believe the Archaebacteria to be survivors of an ancient group of organisms that bridge the evolutionary gap between prokaryotes and A) Eubacteria. B) eukaryotes. C) animals. D) fungi.

Which air masses would have cold, dry air? A. maritime polar B. continental polar C. maritime tropical D. continental tropical

According to condensuon theory, the most important factor for the formation of our plant was

Which of the following are functions of lipids? Choose three correct answers. A. forming the exoskeletons of insects B. forming waxy leaf coverings C. forming bones and cartilage D. storing energy in fat cells E. forming cell membranes F.

The ability of the body to undergo prolonged whole body, large muscle activity is:

In humans a gene that has been identifoef as causing a type of skin cancer is the

Which one of the "big 3" macronutrients is the most calorically dense at 9 calories per gram?