Which describes a difference between cephalopods and gastropods? A) Cephalopods have a water vascular system, and gastropods have an open circulatory system.
B) Cephalopods live only in ocean environments, and gastropods live in a variety of environments.
C) Cephalopods have a simple nervous system, and gastropods have a complex nervous system.
D) Cephalopods are the largest group of mollusks, and gastropods are the smallest group of mollusks.

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.