Answer the following question given this paragraph: Most bacteria may be placed into one of three groups based on their response to gaseous oxygen. What are these three groups?. Q: Most bacteria may be placed into one of three groups based on their response to gaseous? Choices: - potassium - nitrogen - carbon - oxygen A:
oxygen
(Question)
Answer the following question given this paragraph: Mechanical barriers physically block pathogens from entering the body. The skin is the most important mechanical barrier. In fact, it is the single most important defense the body has. The outer layer of the skin is tough and very difficult for pathogens to penetrate. Q: What type of barrier physically blocks pathogens from entering the body? Choices: - Solid - potential - molecular - mechanical A:
(Answer)
mechanical
Ques: Answer the following question given this paragraph: The name silicon dioxide implies one silicon atom and two oxygen atoms, so the formula is SiO2. We have a name that has numerical prefixes on both elements. Tri- means three, and tetrameans four, so the formula of this compound is Si3N4. Q: How many atoms of oxygen does silicon dioxide contain? Choices: - three - six - one - two A:
Ans: two
(Q).
Answer the following question given this paragraph: The idea of evolution has been around for centuries. In fact, it goes all the way back to the ancient Greek philosopher Aristotle. However, evolution is most often associated with Charles Darwin. Darwin published a book on evolution in 1859 titled On the Origin of Species . In the book, Darwin stated the theory of evolution by natural selection. He also presented a great deal of evidence that evolution occurs. Q: The idea of evolution has been around for centuries. in fact, it goes all the way back to the ancient greek philosopher named? Choices: - Xerxes - Pluto - Galileo - aristotle A:
(A).
aristotle
Ques:Answer the following question given this paragraph: Q: Each megasporangium has a single functional one of what? Choices: - antispore - spicule - cocklebur - megaspore A:

Ans:megaspore
Answer the following question given this paragraph: Sympatric speciation While the logic and mechanisms of allopatric speciation are relatively easy to grasp (we hope), there is a second type of speciation, known as sympatric speciation, which was originally more controversial. It occurs when a single population of organisms splits into two reproductively isolated communities within the same physical region. How could this possibly occur? What stop (or inhibits) the distinct sub-populations from inbreeding and reversing the effects of selection and nascent speciation? Recently a number of plausible mechanisms have been identified. One involves host selection.143 In host selection, animals (such as insects) that feed off specific hosts may find themselves reproducing in distinct zones associated with their hosts. For example, organisms that prefer blueberries will mate in a different place, time of day, or time of year than those that prefer raspberries. There are blueberry- and raspberry-specific niches. Through a process of disruptive selection (see above), organisms that live primarily on a particular plant (or part of a plant) can be subject to different selective pressures, and reproductive isolation will enable the populations to more rapidly adapt. Mutations that reinforce an initial, perhaps weak, mating preference can lead reproductive isolation - this is a simple form of sexual selection (which we will discuss soon).144 One population has become two distinct, reproductively independent populations, one species has become two. Q: Sympatric type of what occurs when a single population of organisms splits into two reproductively isolated communities within the same physical region? Choices: - biodiversity - extraction - accumulation - speciation A:
speciation