The correct answers to the above questions are as follows: 1. D. Natural selection refers to the process by which living organisms are able to adapt to their environments, survive and reproduce offspring which have the characteristics that made their parents to survive. Those animals that can not adapt to their environments, will not be able to cope and they will die off. For giraffes, those with the longest necks will be able to reach for food where others can not reach and because they have food to sustain them, they will survive and produce offspring which have very long necks just like their parents. 2. D. Science is a dynamic field and new things are been discovered on a daily basis. Scientist have the culture of carrying out research on each new scientific finding that is put forward in order to discover whether it is true or not. When a new hypothesis, that is contrary to what is already on ground is put forward by a researcher. Scientists in that particular field will work on the new hypothesis in order to determine what it has to offer. If the new hypothesis is found to be true by all the scientist, then it will be considered to be a valid one. 3. A. DNA test is a test that assess the genes of living organisms in order to determine their genetic composition and make up. A DNA test is usually used to determine the level of relationship between two or more living organisms. If a DNA test is carried out on related living organisms, the number of similar genes that will be found in those organisms will be very high. Thus, the test is used to determined the relationship that exist between living organisms. 4. C. Bacteria are able to reproduce human insulin DNA sequence and any other DNA sequence from any living organism, this is so because the genetic code across all living species is the same. This observation suggest that all living organisms evolved from a common source. 5. B. Evolution is the process by which living organisms develop adaptations that make them to survive in their environments, they also give birth to young ones which possess their adaptation characteristics. Antibiotics are effective drugs against bacteria infections, but it had been discovered that the bacteria can develop resistance to these antibiotics, thus managing to survive even in the presence of the drug. This is an example of evolution. 6. B. From the information given above, it can be seen that the scarlet king snake really resemble the venomous coral snake, because of this, its predator will avoid it, thinking that it is the very poisonous coral snake. Because the king snakes are not been eaten by predators, they will increase in number and also give birth to young ones that resemble them. This will make their population to be high in that particular ecosystem.
The correct answer for #1 is D. The correct answer for #2 is D The correct answer for #3 is A The correct answer for #4 is (Not too sure) The correct answer for #5 is B The correct answer for #6 is (Not too sure)
I did this test and these were the answers that I got except for 4 and 6 which I did not get those questions.
Since there are no choices to choose from, I'll just site all the structures of the leaf with its role then.
A Leaf has the following structures: Cuticle Upper epidermis layer Palisade layer Xylem Phloem Spongy mesophyll layer Air space Lower epidermis layer Stomata <span>Guard cells</span>
Major cell parts function just like the structures and people who work together in a factory. Cells have strong cell walls and a cytoskeleton to keep their shape; the walls are made of fiber for protection just like a factory building has sturdy walls for support.
A metalloid is used because it is a semiconductor and can become more conductive when more light shines on it. The most likely materials are crystalline silicon, amorphous silicon, gallium arsenide and organometallics (soluble platinum).
