Answer:
C. hunting and gathering existence.
Explanation:
Paleolithic period, also called Old Stone Age, of human development is characterized by the use of rudimentary chipped stone tools although at that time, humans also used wood and bone tools.
During the Paleolithic Age, hominins grouped together in small societies such as bands existed by gathering plants, fishing, and hunting or scavenging wild animals. Other organic commodities were adapted for use as tools, including leather and vegetable fibers; however were discontinued due to rapid decomposition.
Answer:
The enzyme would be deactivated.
Explanation:
Enzymes are usually deactivated by low temperatures.
<em>Enzymes are proteinous in nature, function by catalyzing biological reactions, and have a particular range of temperatures where they function optimally. Above these temperatures, the catalyzing attribute of enzymes gradually declines till they are denatured by high temperature and below the optimal temperature, their catalyzing attributes also decline. However, instead of being denatured by very low temperatures, they become deactivated instead.</em>
It is pertinent to understand what hypertonic, hypotonic, and isotonic solution means before setting out to explain how a cell reaches equilibrium in each type of solution.
- A hypertonic solution is one whose solute concentration is higher than that of the sap of a cell that is immersed in it.
- A hypotonic solution is one with the same solute concentration as that of the sap of the cell immersed in it.
- An isotonic solution has a lower solute concentration than that of the sap of the cell immersed in it.
In biological systems, water molecules move by osmosis from the region of higher water potential or lower concentration of solutes to the region of lower water potential or higher concentration of solute. An equilibrium is reached when there is no net movement of water between two sides. Hence;
- A cell placed in a hypertonic solution will lose water to the surrounding solution until an equilibrium is reached. This means that such a cell will end up shrinking (wilting) or even dying due to loss of water from the cell sap.
- A cell placed in a hypotonic solution will gain water from the surrounding solution until there is no net movement of water anymore. Such a cell might become turgid or even burst out its cell content.
- A cell placed in an isotonic solution will neither gain nor lose water because the cell sap and the surrounding solution have equal solute concentrations.
More about osmosis here: https://brainly.in/question/1213189