The basis of the process of Natural selection is the random mutation: some organisms develop random mutations which increase their chance for survival and they survive more likely than other organisms and reproduce.
So the correct answer is:
A) Through random mutations in DNA, some pests developed a resistance to the pesticide.
Answer:
True
Explanation:
There are several types of cytokines used in cell signaling; interferons, interleukins, tumor necrotic factor, and chemokines. T helper cells mainly produce interleukins. When activated by Antigen-Presenting-cells, t-helper cells produce interleukins that activate B cells and is significant in their proliferation during an infection.
I think it would be the sclereids cells
The right answer is True.
A watershed is the expanse of territory drained by the waters of rivers and lakes, which in turn converge to a common outlet. Groundwater is flowing into the watershed, although the boundaries may not exactly coincide with surface water. Smaller flow areas that feed subwatersheds can be called catchment basins or drains. Watersheds can flow into river basins that may encompass larger areas.
Known watersheds are separated from one another by ridge lines, also known as watersheds. These are designed to delineate the watershed.
Watersheds are nested networks, the smaller ones nesting in larger ones. Streams that form the watershed can be organized according to a ranking framework. For example, the upper streams at the highest elevation of the watershed are first class streams.
When two first-class rivers meet, they form a second-rate stream. When two second-rate rivers meet, they form a third-class watercourse. A stream joined by another lower ranking stream retains its rank. For example, a third-class watercourse joined by a first or second-rate watercourse remains a third-rate watercourse.
