Since viruses are nonliving, they will need a host in order to take over and spread. Thus, viruses need help in order to reproduce. However on the other hand, Prions are also NON-living but they do not reproduce, they are protein that are not folded properly and continue to create those badly folded proteins to alter the cell.
Answer: Fossils are used to determine the ages of rock layers. Index fossils are of organisms that lived over a wide area.
Answer:
a. food and drink.
Explanation:
Maslow’s hierarchy of needs as represented by a pyramid, has the most fundamental and basic needs placed at the bottom, which are physiological needs. They are followed by safety, love and belonging, esteem, and self-actualization.
Physiological needs include food, drink, shelter. These are needs necessary and essential for physical survival that motivates human behaviors.
<em>Food and drink are the most basic or lowest-level need in Maslow’s hierarchy of human motives
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The cell theory is composed of 3 postulates and depending on the author, sometimes 4 postulates.
1- The cell is the structural unit: it states that all living beings are composed of cells.
2- The cell is the functional unit: It states that all the processes necessary for life occur in the cell.
3- The cell is the unit of origin: It states that every cell comes from another pre-existing cell.
4- The cell is the genetic unit: It states that all hereditary information is found inside the cell.