Answer: A- Disruptive selection
Explanation: Disruptive selection increases genetic variation as the population begins to be more different when selection existing in nature chooses multiple phenotypes reaching the highest degree which each have particular benefits. However, they tend to make single-celled life form that has interposed characteristics to produce smaller offspring while allowing the organisms that have the highest degree of characteristics to produce more offspring.
The mass of the rock is 4,000 g because mass= Density multiplied by volume so you do 200 * 20
Answer:
Renewable Energy Resources.
Explanation:
Unlike fossil fuels which cannot be recovered when destroyed, these sources of energy can be recovered by a means of recycling . Recycling here reduces solid wastes which is one of the causes of land pollution.
Hydroelectric schemes can only be built in mountain regions where rainfall and rivers are plentiful which involves upset of aquatic ecosystem. This poses a dangerous pollution problem though.
Wind generators and solar panels are not very efficient energy producers. However, future schemes for producing solar energy via solar satellites are promising.
Some featured visible in an electron microscope may not be present in the living cell because process involved in preparation alter or distort the cell content.
The most effective sort of microscopes can detect even individual atoms; these are called electron microscopes. However, because the materials are destroyed by the electrons, these microscopes cannot be utilized to observe living cells.
Instead of using light to image specimens, electron microscopes use a particle stream of electrons. Images captured with an electron microscope have resolutions between 0.2 and 10 nanometers, which is 10 to 1,000 times better than that of a conventional light microscope. Additionally, samples can be magnified with an electron microscope up to two million times, compared to 2,000 by a light microscope.
To know more about a microscope, refer to the following link:
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<span>A) bacteria. Membrane-bound organelles are found in eukaryotic cells. However, bacteria are prokaryotic, meaning that they do not have membrane bound organelles.</span>
