Answer:
1. The normal force acting upon the car is best represented by arrow <u>A</u>.
Reason:
The direction of normal force is always upward and opposite to gravitational force that why A is correct option.
2. The force of gravity acting upon the washers is best represented by arrow <u>B</u>.
Reason:
The direction of gravitational force is always downward toward the center of gravity and opposite to normal force that why B is correct option.
3. The applied force on the car is best represented by arrow <u>C</u>.
Reason:
The direction of applied force is along the direction in which it moves. that why C is correct option.
The adaptive immune response is the second line of defense against non-self pathogens. Adaptive immunity, also known as acquired immunity or specific immunity, is found only in vertebrates.
<h3>What is second line of defense?</h3>
Nonspecific resistance, which destroys invaders without targeting specific individuals, is the second line of defense: phagocytic cells ingest and destroy all microbes that enter body tissues.
The adaptive immune response is the body's second line of defense against non-self pathogens. Adaptive immunity, also known as acquired immunity or specific immunity, is found only in vertebrates.
Thus, adaptive immune system is a natural, nonspecific immune response, but it is part of the body's second line of defense.
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<span>Science knowledge relies on experimental and observational confirmation. Where data is incomplete, new or improved data may well lead to revision of accepted science explanations. In situations where observations are fragmentary, it is normal for scientific ideas to be incomplete, but this is also where the opportunity for making advances may be the greatest.The core ideas of science have been subjected to a wide variety of confirmations and are therefore unlikely to change in the areas in which they have been tested. </span><span>Science knowledge may change due to the development of new techniques for observing investigations (including new technologies), and also through new ways of thinking or framing the questions asked.</span>
Autotroph is to producer as Hetrotroph is to consumer
Autotrophs make their own food, which makes them producers
While Hetrotrophs cannot make their own food, and must obtain it from another source, making them consumers
