Answer: Transport proteins act as doors to the cell, helping certain molecules pass back and forth across the plasma membrane, which surrounds every living cell. In passive transport molecules move from an area of high concentration to an area of low concentration.
Answer:
D. The oldest rock is found in the bottom layer of a rock formation.
Explanation:
Answer:
C
Explanation:
Over time the pond accumulates nutrients. This enrichment process is called eutrophication. The addition of nutrients stimulates the growth of aquatic life. These organisms live and grow and die
Answer: The regular progression of a species' replacement is known as ecological succession, or simply just succession.
Explanation: All ecosystems are not static, they change through time. All animals, plants, microorganisms, etc. (different species) create changes to their environments, but other factors such as climate change/weather, over-exploitation, human involvement, and other factors change an ecosystem.
The water cycle moves water from the hydrosphere to the atmosphere to the land and back again. The major processes of the water cycle include evaporation and transpiration, condensation, precipitation and return to the oceans via runoff and groundwater supplies
