Bulk flow refers to the movement of phloem sap from a source to a sink in plants.
<h3>What is Phloem?</h3>
This is a vascular tissue found in plants which helps to transport and distribution of the organic nutrients derived from photosynthesis.
Bulk flow occur when these nutrients present in the phloem sap are moved from source to sink.
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Answer:
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Hello! The largest mass extinction in Earth's history occurred about 250 million years ago, right before the dinosaurs appeared. Devonian Period ended about 355 million years ago, which was before the mass extinction occurred. Therefore, C is eliminated. The Cambrian Period came before Devonian Period, ending around 485 million years ago, which also eliminates A. Ordovician Period ended about 445 million years ago, which also before the mass extinction. B is gone, which leaves us to the last available answer choice being D. The Permian Period ended around 250 million years ago, which was the time of the mass extinction. The largest mass extinction even occurred at the end of the Permian period. The answer is D: Permian.
Answer:
option D
Explanation:
In the process of surgically removing one person,s brain, there is a very high chance that a completely clean cut is not made during this procedure generating scarred nerve tissue which is the inability of nerve tissue to heal properly; scarred nerve tissue also do not transmit signals well. And these neurons do not renew themselves. They do not divide at all. Due to the fact that loss of neurons is usually permanent and the nervous system can permanently lose some of its abilities.
mitochondria
Explanation:
Mitochondria produces energy through the process of cellular respiration.
