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Amanda [17]
3 years ago
9

To measure the vast distance in space ,scientists use a unit called a ______, which is how far travels in one year.

Biology
1 answer:
Fiesta28 [93]3 years ago
3 0

Answer:

light-year; the sun

Explanation:

A light-year is the distance light travels in one year. This means that a light-year is a measure of distance, and is useful on a larger scale because of its large size (light travels a pretty big distance in a year!), so light-years are used by scientists to measure the vast distance in space.

The closest star to the Earth is the Sun.

Gravity is the natural phenomenon in which all objects with mass are attracted to (or gravitate towards) one another. Since gravity is neither a measure of distance nor a star, it doesn't fit any of the answer blanks.

Light is the portion of the spectrum of electromagnetic radiation that is visible to the human eye (between infrared and ultraviolet wavelengths). Since light is neither a measure of distance nor a star, it doesn't fit any of the answer blanks.

A megameter is an instrument for determining longitude by observation of the stars. Since a megameter is neither a measure of distance nor a star, it doesn't fit any of the answer blanks.

Betelguese is a star that is part of the Orion, notable because of its brightness and size, as well as the fact that it is likely to become a supernova in less than a million years. While Betelguese is a star, it isn't the closest star to the Earth. Therefore, it doesn't fit any of the answer blanks.

Hope this helps! :)

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Which statements about the modification of chromatin structure in eukaryotes are true? Select all that apply.
Crank

Ans.

Chromatin molecules are made up of DNA and histone proteins. Modification of chromatin structure include covalent, post-translational changes in histone proteins, present in chromation. Acetylation and methylation are two important histone modifications that affect structure of chromatin molecules.

Acetylation involves addition of an acetyl group to histones that increases transcription of DNA by loosen the association between DNA and nucleosome.

Methylation involves addition of a methyl group to histones that results in condensation of chromatin molecule and thus, decreases transcription of DNA.

Both acetylation and methylation are reversible processes.

Many chromatin modifications are genetic, means they can pass from one generation to another generation, called epigenetic modifications.

Thus, options B), C), D), E), and F).

6 0
3 years ago
Which factors tend to promote higher biodiversity in an ecosystem? Check all that apply.
aleksandrvk [35]

Answer: diversity of niches

, large area and warm climate

Explanation:

An ecosystem is a biotic community in which the living beings interact with their non-living physical environment. The following factors which are responsible for higher biodiversity in an ecosystem:

Diversity of niches: A niche can be define as the functional role an organism performs in an ecosystem so as to sustain it's life. For example the type of habitat, food and breeding season chosen by the organism. With the increase in the differences in the diversity of niches the organism exhibit variations and differences from the members of the same species or from the members of the other species.

Large area: The large area can support the reproduction and abundance of members which belongs to different species hence will help in promoting higher biodiversity in a region.

Warm climate: The warm climatic range will offer the chances of adaptations to the living organisms to sustain their lives in harsh environmental conditions. This will lead to evolution of  new species from the parent species.

5 0
3 years ago
Read 2 more answers
What are two ways people with genetic disorders can be helped?
Alja [10]
The correct answer is: By using karyotypes. They are treated through medical care, education, and job training.

I hope my answer benefited you in some way! c:
6 0
3 years ago
Which pair of terms concerning the osmotic effect of a solution on red blood cells is mismatched?
QveST [7]
Even though there are no choices given in this particular question, the principle of osmosis is very easy to understand. 

When we talk about osmosis, we are referring to the movement of water from a low concentration to a higher concentration. This is different from diffusion, which talks specifically about the movement of <em>solutes</em> in the solution (from a higher concentration to a lower concentration.)

When an RBC is placed inside a <em>hypertonic </em>solution, the water inside the RBC will go out thereby shrinking the RBC.

Inside an <em>isotonic</em> solution, the RBC will remain the same because the concentrations are equal.

Inside a <em>hypotonic</em> solution, the RBC will lyse or explode because water will move from the solution going inside the RBC. 
4 0
3 years ago
Which of the following causes day and night to occur?
Sindrei [870]
The rotation of the Earth in its axis
7 0
3 years ago
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