<h3><u>Answer and Explanation;</u></h3>
- <u>Endosymbiotic theory</u> explains the origin of chloroplasts and mitochondria and their double membrane. Mitochondria of eukaryotes evolved from aerobic bacteria living within their host cell and the chloroplasts of eukaryotes evolved from endosymbiotic cyanobacteria.
- On the other hand according to the <u>autogenous hypothesis, </u>mitochondria and chloroplasts have evolved within the protoeukaryote cell by compartmentalizing plasmids or vesicles of DNA within a pinched off invagination of the cell membrane.
- <u>Endosymbiont theory </u>is the theory that suggests that simple prokaryotic cells were engulfed by larger prokaryotes 1.5 billion years ago.
- <u>Autogenous theory</u> is a theory that was proposed as an alternative to endosymbiont theory. proposes that eukaryotic organelles formed by infolding of the plasma membrane.
- <u>Horizontal gene transfer theory</u> is an alternative to endosymbiont and autogenous theories for the origin of complex organelles in eukaryotes.
The right option is; slab-pull
The main source of downward convection flow in the mantle is called slab pull.
Slab-pull is the force applied by a cold, dense oceanic plate descending into the mantle as a result of its own weight. This process is known as subduction. The oceanic plate has a density higher than that of the hotter mantle below it and the difference in their density causes the plate to submerge into the mantle.
Outside factors seem to effect the Earth on some aspects and seem not to effect it on others.
For example, water tide is effected by the moon's gravitational force, and seasons effects by Earth's location and orientation in relation to the sun.
Some of the environment seems to result by processes internal to Earth's "closed system". For example, overpopulation occurs when a species' population exceeds the carrying capacity of its ecological niche. In this case, ecology plays as the "closed system" factor. Another example can be Drought, which can result from a number of causes based of the weather and climate of a region. In this case we can say those causes are bound to the "closed systemness" of Earth, and shape the problematic situation of drought.
Hope this is helpful :)
Answer:
The answer to "the half-life of a radioactive element is the length of time it takes for half of a given amount of the element to break down, or decay" is true. :)
Descending limb of loop of Henle
It helps to maintain the concentration of urine. It is highly permeable to water thus water is readily reabsorbed from the descending limb by osmosis. It is impermeable to sodium and chloride ions.
<h3>What is a Tubule system ?</h3>
The transverse tubular system is a network of interconnecting rings, each of which surrounds a myofibril
- The nephron uses four mechanisms to convert blood into urine: filtration, reabsorption, secretion, and excretion. These apply to numerous substances
- The distal convoluted tubule (DCT) and collecting duct (CD) are the final two segments of the kidney nephron. They have an important role in the absorption of many ions, and in water reabsorption.
Learn more about Tubule system here:
brainly.com/question/27344521
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