<span>The current explanation for this is an endosymbiotic theory. It is believed that both, chloroplast and mitochondria were once prokaryotic cells (bacteria), living inside larger host cells. The host cells and bacteria formed endosymbiotic relationships long ago. Bacteria inside the host received protection. The aerobic bacteria (oxygen-using) helped the host to exploit O2 for extracting energy and through millions of years became mitochondria. The photosynthetic bacteria have provided crucial nutrients for the host and later became chloroplasts.</span>
Answer:
Obtained through a non-removable product in nature
Explanation:
The value of an ecosystem can be distinguished as: Use value – Can be split into Direct and Indirect use values: Direct use value: Obtained through a removable product in nature (i.e. timber, fish, water). Indirect use value (i.e. sunset, waterfall).
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There should actually be a subscript of 2 on the H. Hydrogen is one of the diatomic molecules, meaning that it is only found in nature in pairs of 2. The second answer is correct.
Answer:
The correct answer is: D. Ebola.
Explanation:
- Ebola Virus is a single-stranded RNA (ribonucleic acid) virus.
- The natural host of the virus is Fruit bat but it can also infect humans.
- The transmission of the virus into humans is mediated from infected bats through body fluids.
- The major disease caused by the virus is is Hemorrhagic fever. In this disease, the platelet (responsible for clotting of blood) count in the blood drops far below normal. As a result, bleeding can get initiated both in the body interior or exterior. This disease can cause multiple organ failure and death.
- Recently, in the year 2018, the Central African country, Democratic Republic of Congo experienced a severely fatal endemic due to the Ebola virus that killed many people within a short period of time.
The answer is D.) All the above