Tiger beetles are such fast runners that they can capture virtually any nonflying insect. however, when running toward an insect, a tiger beetle will intermittently stop and then, a moment later, resume its attack. perhaps the beetles cannot maintain their pace and must pause for a moment's rest; but an alternative hypothesis is that while running, tiger beetles are unable to adequately process the resulting rapidly changing visual information and so quickly go blind and stop.
which of the following, if discovered in experiments using artificially moved prey insects, would support one of the two hypotheses and undermine the other?
(a) when a prey insect is moved directly toward a beetle that has been chasing it, the beetle immediately stops and runs away without its usual intermittent stopping.
(b) in pursuing a swerving insect, a beetle alters its course while running and its pauses become more frequent as the chase progresses.
(c) in pursuing a moving insect, a beetle usually responds immediately to changes in the insect's direction, and it pauses equally frequently whether the chase is up or down an incline.
(d) if, when a beetle pauses, it has not gained on the insect it is pursuing, the beetle generally ends its pursuit.
(e) the faster a beetle pursues an insect fleeing directly away from it, the more frequently the beetle stops.

The correct answer is option (B) "In pursuing a swerving insect, a beetle alters its course while running and its pauses become more frequent as the chase progresses".

Explanation:

One hypothesis suggest that the tiger beetles stop for a moment when they attack because it can't keep its pace and they have to rest, while the other hypothesis suggest that the tiger beetles could not process the rapidly changing visual information when running. The experiments results would support only the second hypothesis if they show that in pursuing a swerving insect, a beetle alters its course while running and its pauses become more frequent as the chase progresses. If a beetle altering its course have to stop more often than a beetle running straight, it would make sense that it has to stop because is unable to process the changing visual information rapidly enough.

question#1

ans:

cell is the basic unit of organization of all living things. cells are often called the building block of life and it is the smallest unit of life. the study of cell is called cell biology. cell consists of cytoplasm enclosed within membrane, which contain bio-molecules such as proteins and nucleic acid.

two third of cell is water, which means that two-third of your whole body is water. the rest is the mixture of molecules, mainly proteins, lipids and carbohydrates.

question#2

ans:

organ:

an organ is a group of tissues specialized to form a functional unit. an example is the heart in animals.

organ system:

an organ system is a group of several organs whose functions are synchronized to release an effective action in a living organism. an example is digestive system.

question#3

different systems perform different function at tissue level. for example, the respiratory system facilitates breathing. in the alveoli tissue of the lungs, the exchange of oxygen and carbon dioxide molecules between the air and the bloodstream occurs by passive transport, so that oxygen is taken in and carbon dioxide and water are removed. different systems of the body carry out different functions. for example, your digestive system is responsible for taking in and processing food, while your respiratory system working with your circulatory system is responsible for taking up oxygen and getting rid of carbon dioxide.

question#4

different systems perform different function at tissue level. for example, the respiratory system facilitates breathing. in the alveoli tissue of the lungs, the exchange of oxygen and carbon dioxide molecules between the air and the bloodstream occurs by passive transport, so that oxygen is taken in and carbon dioxide and water are removed. different systems of the body carry out different functions. for example, your digestive system is responsible for taking in and processing food, while your respiratory system—working with your circulatory system is responsible for taking up oxygen and getting rid of carbon dioxide.

question#5

our body works because of the interactions that happen between organs and organ systems.  

for example:  

the heart to regulate blood flow throughout the body. the blood carries oxygen and nutrients to the cells and carries carbon dioxide and waste away from the cells. body systems work together in maintaining a constant internal environment. when this balance is disrupted, the body systems may not function properly, and human health can suffer.   you start to feel bad.