A gas because you need heat and pressure for a hot air ballon
Water waves are an example of waves that involve a combination of both longitudinal and transverse motions. As a wave travels through the waver, the particles travel in clockwise circles. The radius of the circles decreases as the depth into the water increases. The animation at right shows a water wave travelling from left to right in a region where the depth of the water is greater than the wavelength of the waves. I have identified two particles in orange to show that each particle indeed travels in a clockwise circle as the wave passes.
It was founded in 1930 as the ninth planet of our solar system but currently it is a dwarf planet in the Kuiper Belt.
A deer eats certain plants, but if there is variation, it may like certain plants more than others. The deer may be causing extinction to those certain plants because of eating to much of it. The variation effects the survival of a species because of its unique characteristics called adaptations within the species. If there was a change in an environment, you have a greater chance of survival. Take the deer example. If they had stayed the same, all of that species could have survived because the deer did not eat it, or all of it could have not survived if a new organism changed the environment and ate it. However, with variation only a few of that species may die.