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julsineya [31]
3 years ago
7

Kepler's first law demonstrates that each planet has an elliptical orbit of unique size and shape with the Sun at one focus.

Biology
1 answer:
kramer3 years ago
7 0

Answer:

true, Kepler's first law demonstrates that each planet has an elliptical orbit of unique size and shape with the Sun at one focus.

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What structural feature in a molecule is necessary for a gas to absorb ir radiation?.
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The structural feature in a molecule necessary for a gas to absorb IR radiation is: a net change in dipole moment due to the vibration or rotation of the molecule.

IR radiation is the infrared radiation. In the electromagnetic spectrum, its value ranges from  700 nanometers to 1 millimeter. The waves are longer than that of visible light and shorter than the radio waves. The waves are not visible to the human eye.

Dipole moment is a vector quantity. It is equal to the charge of the molecules multiplied by the distance between the two charges. In a dipole there is a positive charge at one end and a negative at the other. The direction is considered from negative to positive.

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What are pteridophytes?​
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A pteridophyte is a vascular plant that disperses spores. Because pteridophytes produce neither flowers nor seeds, they are sometimes referred to as "cryptogams", meaning that their means of reproduction is hidden. Ferns, horsetails, and lycophytes are all pteridophytes.

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What icon is usually used to indicate an attachment feature?
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An icon is a symbolic representation of an action to be taken, given in emails or message bars. Icons are metaphorical representations of emotions and feelings which a human is unable to explain in words.

The icon used to represent an attachment is paper clip.

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Which of the following are useful traits of cloning vectors?
SSSSS [86.1K]

Answer:

The correct answer is option - e. all of the above are useful traits.

Explanation:

A cloning vector is a small segment of DNA that can be established stably in an individual organism and able to internalize a foreign DNA for cloning purposes. The cloning vector could be taken from different organisms such as plasmid of a bacterium, or DNA from a virus. A cloning vector must possess some characteristics -  

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Thus, the correct answer is option - e. all of the above are useful traits.

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3 years ago
Why is water pollution a density independent factors?
torisob [31]

Answer:

Any factor in the environment that does not depend on the number of members in a population.

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Density independent limiting factors also cause population sizes to increase. For example, the water from a flash flood increases the growth of vegetation, thereby providing more food for primary consumers in the ecosystem.

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