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3 years ago

Why is it important to center a speciment on low power before attempting to focus on it at high power?

1 answer:

7 0

<span> It isn't if you're good with the microscope.

But as far as beginners go, it makes things easier. You have a large "field of view" with the small objective (low power). This means you can get it in focus and center the specimen. When you switch to the high objective (high power) then your specimen will already be partly in focus and centered. If you didn't center it with the low objective you would have a difficult time trying to find it since it wouldn't be lined up and completely out of focus.

Binoculars work with the same principle. You don't look down at the ground with the binoculars then swing them up to the sky and try to find a bird. You look at the bird then you put the binoculars up to your eyes, already looking.

Good luck and have fun! </span>

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Bacteria that are helpful in one place may be harmful in another.

kaheart [24]

Answer:

Bacteria that are helpful in one place may be harmful in another.

What information in the text supports this statement?

A Heliobacter pylori is a bacterium that causes gastritis (irritation or

inflammation of the stomach lining) and peptic ulcers, diseases which were once

thought to be caused by too much acid.

B Streptococcus salivarius appears to help prevent tooth decay in the mouth

but can be dangerous to people with weakened immune systems if it gets

outside the mouth.

Bacillus subtilis releases toxic chemicals to kill fungus, possibly including

Trichophyton interdigitale and other species that cause athlete's foot.

D Skin, which is our interface with the world, supports a large number of the

human body's most diverse populations of bacteria, including Bacillus subtilis.

Explanation:

3 0

3 years ago

Name a group of invertebrate animals that is usually hermaphroditic

katrin2010 [14]

Answer:

Many of the parasitic invertebrates like worms are hermaphroditic.

Explanation:

A hermaphroditic organism can be described as an organism that has bole male and female gametes and can produce both female and male reproductive organs. In animals like snails and worms, hermaphroditism allows either partner to become male or female. While many of the other organism can undergo self-reproduction.

Hermaphroditism can also be seen in plants mainly the angiosperms.

In humans, the people possessing this quality are called intersex humans.

7 0

3 years ago

PLEASE HELP! - Describe why carbon, hydrogen, oxygen, nitrogen, & other elements can combine. Describe the results of these

lbvjy [14]

Answer:

Carbon, Oxygen, Hydrogen And Nitrogen - Have In Common? They All Have The Same Number Of Valence Electrons. They All Have Unpaired Electrons In Their Valence Shells. They Are Elements Produced Only In Living Cells.

7 0

3 years ago

Lactic acid fermentation occurs in

Wewaii [24]

Lactic acid formation occurs in B) The yeast cell.

8 0

4 years ago

Determine the proportion of offspring phenotypes that would result when two merle dogs mate, if both dogs are heterozygous (Ll)

Brut [27]

Answer:

75% would have the dominant traits for coat length, 25% would have recessive trait for coat length.

Explanation:

After completing a punnet square, we could find that our genotypes are 25% LL, 50% Ll, and 25% ll.

If these genotypes were to be physically expressed, LL and Ll would both be expressed as showing the dominant trait.

This means that 75% would have the dominant traits for coat length and 25% would have recessive trait for coat length.

I hope this was helpful! Let me know if you need any clarity.

6 0

3 years ago