Magnetic force - B.
Electrical force - A.
Gravitational force - D.
Contact force - C.
<h3><u>Explanation:</u></h3>
When a charge moves about its path, it produces a magnetic force around it. This magnetic field is perpendicular to the axis of movement of the charge and is directly proportional to the amount of charge, speed of the charge, and inversely proportional to distance between the charge and the point of measurement. Michael Faraday discovered this phenomenon.
Electrical force of attraction or repulsion is seen between the two charged bodies, or one charged body and one uncharged body which can induce charge to the uncharged body. The attraction or repulsion between the charged bodies are seen if the bodies are close enough, and this is called electrical force.
The gravitational force is also a non contact force that is seen between two bodies which is always attractive in nature and is seen between any two bodies.
A contact force like friction is a type of force that takes place only when two bodies are in contact with each other.
Answer:
The tendency of water molecules to stick to other molecules also allows water to dissolve substances that are important to life, such as ions, DNA, and many proteins. This is necessary for life because molecules that have been dissolved in water or another polar solvent interact with each other more readily.
Heterotrophs are organisms that must consume food from other organisms because they are unable to synthesize their own food molecules.
<h3>What is heterotrophs?</h3>
- An organism is referred to be a heterotroph if it is unable to manufacture food on its own and must obtain it from other sources of organic carbon, primarily plant or animal materials.
- Heterotrophs are primary, secondary, and tertiary consumers in the food chain but not producers.
- Because they eat producers or other consumers, heterotrophs are referred to as consumers.
- Humans, dogs, and birds are all instances of heterotrophs.
- In a food chain, a group of creatures that supply energy and nutrients to other organisms, heterotrophs occupy the second and third levels.
- An organism is referred to as a heterotroph if it consumes other plants or animals for food and energy.
- Its origins are in the Greek words hetero, which means "other," and trophe, which means "nutrition."
- Autotrophs and heterotrophs are two main classifications of organisms depending on how they receive energy and nutrients.
Learn more about heterotrophs here:
brainly.com/question/21450466
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The answer to number 12 is mate.
