Answer:
Most like a police officer. Because the cell membrane allows things in and out of the cell, as for a police officer in and out of a crime scene
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Human beings seek to build dams because because dams acts as water reservoirs. They are useful in releasing water in a controlled way, thus floods can be avoided. Moreover, hydroelectricity can be produced from this stored water. Helpful in irrigation process due to controlled release of water. Now-a-days these reservoirs of water are also utilized in aquaculture practices.
Answer:
In a bryophyte, all the conspicuous vegetative organs, including the photosynthetic leaf-like structures, the thallus, stem, and the rhizoid that anchors the plant to its substrate, belong to the haploid organism, or gametophyte.
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Answer: It's known as the continental drift :)
Explanation: "Pangea's existence was first proposed in 1912 by German meteorologist Alfred Wegener as a part of his theory of continental drift. Its name is derived from the Greek pangaia, meaning “all the Earth.”" (copied from google)