<span>DNA is made of chemical building blocks called nucleotides. These building blocks are made of three parts: a phosphate group, a sugar group and one of four types of nitrogen bases. To form a strand of DNA, nucleotides are linked into chains, with the phosphate and sugar groups alternating.</span>
The Precambrian time refers to the time 4.5 billion to 542 millions year ago. This period is characterized by having reduced atmosphere and included reduced compounds. Scientists believed that atmosphere at that time was devoid of free oxygen and CO2 was present in excess. Before the complex life evolved on the Earth, the Precambrian Earth's ocean contained dissolved carbon dioxide.
This is correct, because aerobic is more efficient than anaerobic, making it preferable. Cellular respiration is energetically more efficient than anaerobic respiration.
<h3>Cellular respiration and anaerobic respiration </h3>
Cellular respiration refers to the generation of energy in the form of ATP in presence of oxygen.
Conversely, anaerobic respiration generates energy (ATP) in absence of oxygen.
Cellular respiration is an energetically more efficient pathway than anaerobic respiration, thereby facultative organisms generate ATP by cellular respiration when it is possible.
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The brain's suprachiasmatic nucleus regulates the body's circadian rhythms. The suprachiasmatic nucleus is a minute region of the brain located in the hypothalamus above the optic chiasm, the circadian rhythm is the 24-hour cycle of organisms, related to sunlight and temperature.
Answer:
adaptation-the inherited characteristic that increases an organism's chance of survival and to reproduce.
fitness -the ability of an organism to survive and reproduce in its environment
