The water cycle moves matter around the Earth. Liquid water from oceans, rivers and lakes and rises into the atmosphere. Plants can also release water into the atmosphere through
. Gaseous water in the atmosphere
into the clouds. If the cloud droplets become large enough, they fall to the ground as
, such as rain, snow or hail. Liquid water then moves into the ground, also known as
or it can return to rivers, lakes and oceans as
. In all cases, the water cycle is moving molecules of water from one place to another.

1. Fitness is not a trait but a technical embodiment of assumptions about selection. ... Adaptations are polished products of natural selection with particularly clear relationships to particular problems faced by the organisms that posses them. 2. Fossils are the remains of long-dead organisms, preserved in rock. Because rocks are laid down in layers, one on top of the other, the fossil record is generally set out in date order: the oldest fossils are at the bottom. Running through the fossil record makes it clear that life has changed over time. The scientific evidence for evolution is overwhelming. Volumes of data collected in the field and the laboratory show that all species arose from common ancestors and that species change over time. A classic example is the finch population on the Galapagos Islands.

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