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iren2701 [21]
3 years ago
8

In the history of astronomy, which of the following is true?

Biology
1 answer:
Naya [18.7K]3 years ago
3 0

Answer:

Johannes Kepler was a student of Tycho Brahe.

Explanation:

Johannes Kepler joined the wealthy astronomer Tycho Brahe as a student as assistant. After the death of Brahe, Kepler used his observations data and based on it formulated the three laws of planetary motion. Galileo described the heliocentric model with planets revolving about the Sun in circular orbits which was corrected by Kepler. He corrected that the orbits are elliptical.

Ptolemy believed in geocentric model, according to which Earth is at the center of the universe. Galileo did not built observatory. Issac Newton believed in heliocentric model of the universe.

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3 years ago
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Which organs are responsible for destroying old red blood cells?
Elan Coil [88]
<span>Spleen is also known as the graveyard of RBC, if it helps u 

1.Stem cells in bone marrow make all blood cells. RBC lives about 120 days. 
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2.Reticuloendothelial cells participate in the destruction of senescent RBC's. The spleen is a well suited site of RBC destruction given that cells must course through 2-3 micron apertures in the walls of splenic sinusoids, which is an ultimate test of cell pliability. Rigid cells are entrapped and phagocytosed. Intra-erythrocyte inclusions are removed during splenic circulation. 
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3. Another site reported that 
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3 years ago
Please HELP!! Place the events 1 to 7 in order of how they happen during speciation.
hoa [83]

Answer:

6, 3, 4, 5, 7, 2, 1

Explanation:

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Now there were two butterfly populations and they faced different environment from each other. Over the time, the populations adapted to their local surroundings and started to accumulate changes in their genome. Their gene pools started to separate from each other. Eventually they evolved into two different species. When their old habitat was restored in the valley, they returned once again. However, this time they were not able to interbreed because they were now two different species.

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3 years ago
Which molecule is active first during DNA replication?
just olya [345]

Answer:

C

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skelet666 [1.2K]

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