(Q).
Q: What normally prevent a positively charged particle from colliding and reacting with a positively charged nucleus, but may be overcome by kinetic energy?. Read this paragraph and choose the correct option from the provided answers: Bombarding a target of one element with high-energy nuclei or subatomic particles can create new elements. Electrostatic repulsions normally prevent a positively charged particle from colliding and reacting with a positively charged nucleus. If the positively charged particle is moving at a very high speed, however, its kinetic energy may be great enough to overcome the electrostatic repulsions, and it may collide with the target nucleus. Such collisions can result in a nuclear transmutation reaction. Choices: - kinetic repulsions - toxic repulsion - evaporation repulsions - electrostatic repulsions A:
(A).
electrostatic repulsions

(Q).
Q: What is the term for something left behind by once-living organisms? Read this paragraph and choose the correct option from the provided answers: Most sedimentary rocks form from sediments. Sediments are small pieces of other rocks, like pebbles, sand, silt, and clay. Sedimentary rocks may include fossils. Fossils are materials left behind by once-living organisms. Fossils can be pieces of the organism, like bones. They can also be traces of the organism, like footprints. Choices: - decay - waste matter - deposits - fossils A:
(A).
fossils

(Q).
Q: There are two types of digestion, mechanical and what else? Read this paragraph and choose the correct option from the provided answers: Digestion consists of mechanical and chemical digestion. Choices: - radiation - mineral - thermal - chemical A:
(A).
chemical