Many countries use DDT to control the spread of deadly __________.

Answers

Answer 1
Answer: DDT is used to repel and kill disease carrying mosquitos 

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Precipitation includes ______. hail rain snow all of the above

Use carbon dioxide in sentence

Answers

Answer:

water splash that is carbon dioxide

Explanation: water drip splash

My body can not contain carbon dioxide.

Many residents in a small town have developed a bacterial infection. Two students hypothesize that the bacteria are coming from the town’s drinking water. They look for the bacteria in water samples from the lake that supplies 80 percent of the town’s drinking water. When they find no bacteria, the students conclude that the town’s residents are not getting the bacteria from their drinking water. Which is a source of error in the students’ experimental design?

Answers

OPTIONS:

a. Water from the late was not tested for other possible pathogens b. Residents of other nearby towns were not tested for the bacteria c. The residents' genetic predisposition for getting ill was not determined d. Other sources of drinking water were not tested for bacteria

Answer:

d. Other sources of drinking water were not tested for bacteria

Explanation:

The source of error in the experimental design of the students stems from the failure to collect samples from other sources of the town's drinking water. The samples collected and tested were simply unrepresentative of the drinking water supply of the town, as the samples collected only represented water from the lake, which is 80% of the town's supplies of drinking water.

To arrive at a good conclusion, samples collected should represent adequately, all sources of drinking water of the town, rather than just representing supply from mainly the lake, which accounts for 80%.

It could be that the source of bacterial infection might emanate from other sources of drinking water that was not represented in the samples collected for testing.

The students only tested the drinking water supplied by the lake. This 80% may not contain the bacterial infection, but the other 20% from unknown sources(which they didn't account for in their conclusion) may.

An animal that hides under a rock to avoid predators is responding to a(n) _____ stimulus.

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An animal that hides under a rock to avoid predators is responding to an instinctive stimulus.

Water molecules exhibit a property by virtue of which they can stick to each other. What is this property referred to as?

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The water molecule has the ability to form hydrogen bonds, between atoms of oxygen and hydrogen of different molecules (they can also be formed between atoms of hydrogen, phosphorus, and nitrogen, but in the case of water we refer only to hydrogen and oxygen). When this phenomenon occurs between molecules of the same species (one molecule of H2O with another molecule of H2O), it is called cohesion, which is the attraction that molecules have for others of the same type. In the case of water, cohesion occurs thanks to hydrogen bonds, and this union is very strong and difficult to break.

Its referred to as  cohesion

What is the relationship between the oxygen cycle and the carbon cycle?

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Plants utilize carbon dioxide in a method identified as photosynthesis. During photosynthesis, plants yield off oxygen as a decay product. Carbon dioxide passes from the atmosphere into the needles of plants by tiny holes in the plant's leaves.

Both Oxygen cycle and carbon cycle acts independently but are subordinate on each other because the carbon cycle provides off oxygen for the oxygen cycle to use, and in return, the oxygen cycle releases carbon dioxide (CO2) which goes back into the carbon cycle. Plants are the principal vehicle by which the oxygen and carbon cycles are correlated.

Oxygen is created through photosynthesis when carbon dioxide from the air enters through the plant's leaves. Oxygen then exists the plant by its leaves and into the air.

________________ are hollow tubes of protein that maintain cell shape and permit movement of cell organelles

Answers

Answer:

Microtubules.

Explanation:

The main cytoskeleton of the cell is micro tubules, micro filaments and intermediate filaments. This structure helps to provide the stability and maintains the cell shape.

Microtubules are made of the polymers of tubulin. The microtubules are hollow shape like protein that forms the main part of the cyoskeleton. The microtubules maintains the cell shape and allows the movement of the cellular organelles of the cell.

Thus, the correct answer is microtubules.

Microtubules are hollow tubes of protein that maintain cell shape and permit movement of cell organelles.