BIOLOGY HIGH SCHOOL

Polly is pushing a box across the floor with a force of 30 N. The force of gravity is -8 N, and the normal force is 8 N. Which value could describe the force of Polly could not make the box

Answers

Answer 1
Answer:

Answer:

-30 N

Explanation:

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Which of the following are examples of trisomy?Turner Syndrome, Down's syndrome, or Klinefelter's Syndrome

Answers

Example of Trisomy 21 detected... the presence , which is found in Down syndrome, is calledtrisomy 21. ... Of these, Trisomy 21 and Trisomy 18 are the most common. ... XXX (Triple X syndrome); XXY (Klinefelter syndrome); XYY ... Turner syndrome (XO).   


so i think all are right

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.

A plant cell cannot produce enough energy which organelle is not to blame

Answers

Answer:

mitochondria

Mitochondria is the cell responsible for producing energy in the plant cell

True or falce in a particular envionment two species can usually occupy the same niche

Answers

The answer is false. If two different species occupy the same niche in the environment they would surely compete for each other, compete for food and even for their lives. Until one last specie will remain 

What causes the day/night cycle of Earth?Earth's spinning in space
The sun's rotation around Earth
The moon's rotation around Earth
Earth's orbit around the sun

Answers

Earth's orbit around the sun

Explanation:

The definition of an orbit is a circular shape, the rotation of one full circle or a range of experience. The 365 days it takes the earth to get around the sun is an example of the time it takes for a complete orbit or full circle around.

How does rust make steel weak?

Answers

The reddish-brown flakes we found in metals are called rust. Rust are iron oxide. It is the product when an iron reacts with oxygen. Which is why metals rust when exposed to air and water. The process is called corrosion. By then metals get weaker because the strong irons are replaced with iron oxides which are flaky powder. 
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