According to this theory, the Sun and all the planets of our Solar System began as a giant cloud of molecular gas and dust<span>.</span>
Answer:
Faciliated diffusion, which requires a carrier protein but no cellular energy. The energy for this process is provided by the concentration gradient of the substance being transported.
Starfish, or more accurately sea stars, fill a niche as predator and prey in marine ecosystems close to shore. With more than 18,000 species in the world, they range from the tropics to the Pacific Northwest and further north. They can grow larger than a foot across and can have as many as 40 arms. While sea stars are known for their ability to regrow lost arms, they have an unusual digestive system, too.
Answer:
process of bacterial conjugation.
Explanation:
Plant cells have walls that arent very flexible, so a plate forms in between the cells, and the cell splits in half.