Answer:
Option (a).
Explanation:
Phylogentic tree may be defined as the the diagrammatic representation of the evolutionary relationship of the organism. The phylogenetic trees are made on the hypothesis and do not explain any fact.
The branching in the phylogenetic tree determines the evolution of the species from the common ancestor. The common ancestor is located at the base of the phylogenetic tress. Since, Ardipithecus ramidus is located at the base it shows that Ardipithecus ramidus is a common ancestor.
Thus, the correct answer is option (a).
A article, book. many things can include descriptive writing.
<u>Answer:</u>
Mitochondria, the organelles involved in cellular respiration, can also generate chemicals called reactive oxygen species (ROSs). ROSs can damage mitochondria. Damaged mitochondria generate more ROSs than healthy mitochondria. This is an example of a positive feedback mechanism
The reactive oxygen species that are given out by the mitochondria during cellular respiration are the major cause of aging. Though this has a lot of negative effects but this also has a small amount of positive effects such as the start of angiogenesis or cell proliferation.
Answer:
The stomach is J-shaped and it can expand to temporarily store food. Partial digestion of the food takes place here. The churning action of the stomach muscles physically breaks down the food. The stomach releases acids and enzymes for the chemical breakdown of food.
Explanation:
The correction option is B.
DNA is the genetic material in living organisms and it is the basis for inheritance. DNA molecule is made up of nitrogenous bases, deoxyribose sugars and phosphate groups. In order for the genetic information in the DNA molecules to be preserved, the components of the DNA must be arranged in the correct order without any any error. Thus, for the nitrogenous bases inside the DNA molecule, they must be correctly paired with one another.
