<span>A light ray is one narrow beam of light traveling in a straight line. </span>It is the most basic element in geometrical optics. <span>A light ray is an idealized and hypothetical model of a light that is used to better explain the propagation of light. In reality, light travels as a wave and can therefore be bent.</span>
D. This is because convection is the process of heat passing through liquid or gas.
Answer:
Those that are able to acquire their food and shelter needs in order to survive and reproduce.
Explanation:
Answer:
protect against pathogens
Explanation:
Observation and investigate main problem disease