BIOLOGY HIGH SCHOOL

Which one of the following types of microscope gives the highest amount of magnification?A. compound light
B. TEM
C. dissecting
D. SEM

Answers

Answer 1
Answer: Magnification is how large a microscopic image is compared to real life.  An electron microscope is more advantageous over a light microscope for use with very small objects because electron microscope provide higher resolution and magnification.  A light microscope such as dissecting and compound light microscopes are use for low magnification.  examples of electron microscope are Transmission Electron Microscope (TEM) and Scanning Electron Microscope (SEM). A SEM however offer 2 million as a maximum level of magnification whereas TEM offers up to 50 million.  therefore TEM gives the highest amount of magnification.
Answer 2
Answer: the answer is Electron microscope The scanning electron microscope(SEM) have the highest magnification. Its magnification varies from about 10 to 500,000 times

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Single-celled organism can get the oxygen they need across their cell membranebecause...

A. they have a small surface area to volume
ratio to allow sufficient transport of molecules into and out of the cell

B. they have a large surface area to volume
ratio to allow sufficient transport of molecules into and out of the cell

Answers

Answer: B

Explanation:

If two mouse species tried to occupy the same niche in a meadow, the two species would be in __________, and the competitive exclusion principle would apply. One species would win out over the other, and the population of the losing species would die out. A. exclusion B. competition C. inclusion D. colonization

Answers

Answer: B. competition

Explanation:

A niche can be define as the functional role which an organism plays in an ecosystem to sustain it's life. For example, the type of food the organism eats, or type of habitat chosen.

Generally, when two species exhibit a same niche, competition for resources develop between the two species.

According to the competitive exclusion principle when two or more species compete for the same resource the one which is superior over the other receives the resources and the population of weaker species decline.

In the given situation competition will develop between the two species of mouse as they exhibit same niche and competitive exclusion principle on two mouse population will apply.
the correct answer would be b. competition   

Give an overview of four different symptoms in the human body that are caused by air pollution.

Answers

The four symptoms in the human body caused due to air pollution are:

•Itching and redness in eyes: This is a very common symptom easily seen in the people as an effect of air pollution. Redness and itching is caused due to inflammation in eyes.

•Coughing: Coughing is also caused due to inflammation in the bronchi. The mucosa secreted encounters some foreign materials and as a result of this coughing starts.

•Sneezing: The nasal passage has some mucosal secretion which when encounters the dust particles starts sneezing.

•Nausea: Some people feel nausea due to gases that causes air pollution

The four different symptoms in the human body that may be caused by air pollution are coughing, sneezing, nausea, redness and itching in eyes.

Further Explanation:

The addition of any harmful substance or gases mainly referred as pollutant into the air so as to change the natural composition of air is called air pollution. In this various solid, gases, or liquid particles releases in the environment. These pollutants are release into environment in the high concentration that affect health, aesthetic or economic effects.

The major symptoms of air pollution are:

  • Redness and itching in eyes: It is a very common symptom which can be easily visualize in individual as an effect of air pollution. Itching and redness is developed due to the swelling in eyes.
  • Sneezing: In this condition, the nasal passage consist mucosal secretion when the dust particle trap in the mucous an individual is start sneezing.
  • Coughing: This condition is developed due to swelling in the bronchi. The mucosa secreted in the bronchi encounters with foreign particles due to this coughing begins.
  • Nausea: The harmful gases release in the environment majorly causes nausea in some individual.

Learn More:

Answer Details:

Grade: High School

Subject: Biology

Chapter: Pollution

Keywords:

Nausea, coughing, sneezing, bronchi, mucosal secretion, redness, itching, gases, pollution, pollutant, solid, gases, liquid.

These polar bears can be found all around the North Pole. The natural environment where any species lives is called its

Answers

The natural environment where any specie lives is called its HABITAT.
An habitat refers to the ecological or environmental area where a particular animal specie or plant specie can be found. Living organisms usually get all they need to survive from their habitats. There are different types of habitat and living organisms have capacities to adapt to their habitats.
the answer is habitat

A young boy, who is normally gentle and kind, is showing signs of aggression and anger after falling off the monkey bars on the playground and hitting his head hard on the ground. After examination, the doctor determines he has damaged part of his:

Answers

Answer:

Prefrontal cortex

Explanation:the prefrontal cortex is the forward most part of the frontal lobe.it consists about 10% of the brain..it is associated with making decisions and evaluation of right and wrong.it could also influence the personality of a person.

A damage to the prefrontal cortex can cause change in Personality, rudeness and make the person incapable of making good judgement and social skills.

The elimination of a predator has no negative impacts on that predator’s prey species.a. True
b. False

Answers

Answer:

The given statement is False.

Predator-prey relationship is a biological relationship in which one organism kills and eat the other organism in an ecosystem. The organism who killed is termed as predator and the organism who is killed is termed as prey.

It helps in controlling the population size of prey, helps in slowing down the spread of the disease, and in the establishment of a healthier prey population by removing or killing the injured or sick animals.

Complete removal of the predators will lead to the overpopulation of their prey which is generally herbivores. The over-populated herds will eat more and more grass which will ultimately lead to the shortage of food.

So, the herds will starve to death.

Hence, we can conclude that the removal of predator has negative impacts on that predator’s prey species.

Answer:

False

Explanation:
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