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Passive Transport: Simple Diffusion
Diffusion across a cell membrane is a type of passive transport, or transport across the cell membrane that does not require energy. Remember that the cell membrane is a phospholipid bilayer. Although the inside and the outside of a cell are both water-based, there is a hydrophobic region in the middle, and this is an important barrier to anything large, charged, or hydrophilic. Molecules that are hydrophobic, just like the hydrophobic region, can pass through the cell membrane by simple diffusion.
Therefore, simple diffusion is the unassisted passage of small, hydrophobic, nonpolar molecules from a higher concentration to a lower concentration. Very small molecules can slip through the cell membrane, too, even if they are hydrophilic - just like a few ants might crawl through a crack in the wall just because they're tiny.
Answer:
Ecosystem, community, population, organism
Explanation:
Ecosystem: It is a level of organization in which different communities of different organisms along with their related abiotic factors, interact with each other.
This is a level of organization smaller than a biosphere and a biome.
Community: It is a level of organization in which different populations interact with each other while living with each other. It is a level below ecosystem but above population.
Population: A group of organisms that belong to same specie and can interact with each other to produce fertile offsprings.
It is a level below ecosystem and community but above organism.
Organism:
A living organism that is made up of organs and organ systems. This is a level below population.
Hope it helps!
The universe is defined as all the space, matter, and all forms of energy existing together. The formation of the universe is explained by the Big Bang theory.
The statements about the universe that are correct:
- dark matter exists
- the invisible matter must be influencing the rotation of galaxies
- galaxies spin faster than they should be based on visible matter
Scientists and advancements in research show that dark matter exists in the universe, but scientists are not sure about the composition of dark matter.
The spiral galaxies generally rotate at a speed proportional to the amount of visible matter. Recent research has shown that super spirals are rotating must faster than the predicted visible mass and have a high ratio of dark matter.
Thus, statements 1, 3, and 4 are correct.
To know more about the universe, refer to the following link:
brainly.com/question/9724831
