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Shtirlitz [24]
3 years ago
8

How is it possible for white dwarfs to have a lower luminosity than the sun even though it is much cooler?

Biology
1 answer:
ratelena [41]3 years ago
4 0

Answer:

White dwarfs have an extremely small surface area to radiate this heat from, so they cool gradually, remaining hot for a long time.

Explanation:

As a white dwarf cools, its surface temperature decreases, the radiation which it emits reddens, and its luminosity decreases.

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Que signifie ADN et comment on le prouve?
irakobra [83]

Answer:

<h3>Qu'est-ce que l'ADN ?</h3>

L'ADN (acide désoxyribonucléique) est un type d'acide nucléique qui se distingue par le stockage de l'information génétique de la grande majorité des êtres vivants. Cette molécule est formée de nucléotides et a généralement la forme d'une double hélice.

Il est nécessaire de prélever des échantillons de certains fluides corporels qui peuvent être du sang, de la salive, des ongles, des cheveux ou du sperme. À l'aide de techniques de laboratoire sophistiquées, l'ADN des échantillons est isolé, puis une cartographie est effectuée, ce qui est fait par des équipements appelés "Séquenceurs d'ADN".

Pour le prouver, normalement le rapport d'un examen ADN apporte quels gènes et chromosomes ont été étudiés et l'analyse du généticien à leur sujet. Les résultats sont présentés dans des rapports simples et clairs. Dans les examens de paternité, le résultat est toujours comparatif.

J'espère t'avoir aidé, bonnes études !

7 0
2 years ago
What are the 3 theories for the extinction of the dinosaurs?
maksim [4K]
One will be due to climatic change or it might be coz of evolution
4 0
4 years ago
If a cell loses control of gene expression what happens?
Bond [772]

Answer:

Abnormal, unhealthy cells will develop.

7 0
4 years ago
In the human body, oxygen is absrobed by the lungs and nutrients are absorbed by the small intestine.In a single-celled organism
SOVA2 [1]

Answer:

cell membrane

Explanation:

Single cell organisms like the bacteria depend mostly on diffusion for gaseous exchange. They take in food that does not require complex digestion processes. The cell membrane is selectively permeable and allows absorption of nutrients like glucose that have molecules of small size.

4 0
3 years ago
What is a balanced equation for the process of photosynthesis ?
Crazy boy [7]
Glucose + oxygen. 6CO2 + 6H2O → C6H12O6 + 6O2.
6 0
3 years ago
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