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Irina18 [472]
3 years ago
8

18.) When and by whom was the idea of a spherical Earth first

Biology
1 answer:
Natasha2012 [34]3 years ago
7 0
300 BC by Greek philosophers
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Why is a sidereal day shorter than a solar day on earth?
Nadusha1986 [10]
The Sidereal Day is 4 minutes shorter than the Mean Solar Day, because the rotation of the Earth on its axis, and the orbiting of the Earth around the Sun, are both counterclockwise, as viewed from above (or north of) the Ecliptic Plane. See planetary retrograde motion for an example of the opposite situation.

The reason that the Solar Day varies around the Mean Solar Day is that the Earth moves at different speeds through its orbit around the Sun. This is in keeping with Kepler's Second Law of Planetary Motion.

Please note that the Mean Solar Day changes over a long period of time, due to the slowing of the rotation of the Earth due to tidal forces exerted on the Earth primarily by the Moon. For example, the Mean Solar Day was about 23 hours about 250 million years ago.
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3 years ago
Contrast the structure of a bastula with that of a gastrula?
OLEGan [10]

Answer:

Blastocyst,Blastoderm

Explanation:

The blastula is made up of a hollow spherical layer of cells, referred to as the blastoderm which surrounds a yolk or fluid-filled space called the blastocele or blastocoel. In most mammals, including humans, the structure formed next is the blastocyst, a mass of inner cells that are distinct from the blastula

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3 years ago
What is the genotype ratio?
USPshnik [31]

Answer:

B. 2 : 0 : 2

Explanation:

In a punnet square, the alleles would be Tt, Tt, tt, tt. So, you have 2/4 or 50% of the genotype Tt, and 2/4 or 50% of the genotype tt.

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3 years ago
How does a dietician help a patient?
3241004551 [841]

Answer:

patient care – dietitians in hospitals and nursing homes educate patients and family members on eating well. They work with them to make sure that diets meet individual needs. They develop menus to meet patients' nutritional needs.

Explanation:

Happy to assist! If you have any questions or comments, plz comment in the boxes below! Have a wonderful day!!!!!!!!

            -Mackie

3 0
3 years ago
Read 2 more answers
All organisms in Kingdom Animalia are multicellular, meaning their bodies are composed of more than one cell. Which other charac
Monica [59]
Most animals in Animalia have backbones, but not all.
The correct answer would be C, because all organisms in Animalia are heterotrophs which means that they depend on other organisms (like animals and plants) for food.
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3 years ago
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