Answer:
The correct answer is - exocytosis.
Explanation:
All of the given options of the transport mechanism are the transport of the substances either into the cell or out of the cell or both. Active transport is the transport mechanism that involves the transports of substances from the lower concentration region to the higher concentration region and utilize energy.
Endocytosis and exocytosis are the forms of active transport, however, endocytosis involves taking material into the cell and exocytosis out of the cell. Exocytosis is the form of active transport as it requires energy to moving materials from within a cell to the exterior of the cell.
D
Freshwater;
- It constitutes approximately 30% of Earth's freshwater.
- It is the only viable source of freshwater in some areas.
- It is available in conditions of drought.
Explanation:
Groundwater is water that is located under the surface of the earth in the rocks of the crust usually filled by the percolation of water from precipitation. During drought, when all surface waters have dried up, wells can be dug to access groundwater in aquifers. This groundwater is also important in regions where surface waters have been contaminated such as by industrial waste. However, it is important that this water is not overdrawn. The rate at which it is drawn should match the rate at which the waters are refilled by percolating water into the ground.
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Answer:
The flow of heat from Earth's interior to the surface is estimated at 47±2 terawatts (TW) and comes from two main sources in roughly equal amounts: the radiogenic heat produced by the radioactive decay of isotopes in the mantle and crust, and the primordial heat left over from the formation of Earth.
Biodiversity occurs within self sustaining ecosystems
Answer:
- A species is a group of individual organisms that interbreed and produce fertile viable <em><u>offspring.
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Members of a species share similar DNA make up that make them compatible to interbreed and reproduce successfully. For two group of individuals to be considered of same species, they must be able to interbreed and produce offspring that are fertile and viable. E.g. a horse and a donkey are two different species that cannot interbreed and reproduce offspring that are viable and fertile. These two species have been said to be interbred but produced an offspring known as the mule, which is sterile and not fertile.
- Temporal isolation can result in species that are physically similar and may even <u><em>live in the same habitat, however, the breeding schedules of both population of the species must overlap for mating between both species to take place.</em></u>
Temporal isolation is a type of prezygotic reproductive barrier that occurs when two populations of a species have different breeding seasons, and so, cannot meet to interbreed to produce offspring, even though they may be dwelling in the same habitat.
- In another postzygotic situation, reproduction leads to the birth and growth of a <u><em>hybrid that is sterile.</em></u>
Postzygotic barriers as another reproductive barrier are mechanisms that prevent successful reproduction after zygote has been formed from fertilization. Two situations usually arise in postzygotic barriers:
1. The hybrid formed after fertilization in form of zygote, dies at the embryonic stage. This situation is referred to as hybrid inviability.
2. The hybrid formed after fertilization in form of zygote develops and survives both is sterile and unable to reproduce offspring of their kind. This situation is referred to as hybrid sterility.