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Papessa [141]
2 years ago
8

Charles darwin acknowledged the importance of sexual reproduction when formulating his theory of natural selection.

Biology
1 answer:
Valentin [98]2 years ago
7 0
<span>this statement is actually true. Charles Darwin created his theory of evolution by natural selection in 1859. It was an explanation for how species adapt and carry on. He believed that natural selection was something that occurred that allowed each slight variation of a trait in things to be useful and be preserved.</span>
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What are some outcomes of nuclear fusion?
Svetlanka [38]

Answer:

A. produce larger materials from the collision of smaller materials

Explanation:

The outcome of nuclear fusion reaction is that it produces larger materials from the collision of smaller materials.

  • Nuclear fusion is the combination of small atomic nuclei into larger ones with the release of a large amount of energy.
  • The energy released provides the needed temperature for another set  of atoms to fuse.
  • This process in turn yields a bulkier material accompanied with the release of a lot of energy.
8 0
3 years ago
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What atoms are organic molecules in cells made of ?
Vitek1552 [10]

Answer:

All organic molecules are made up of carbon compounds so we can say that the main atom or molecule is carbon.

hope it helps!

4 0
3 years ago
Is blood clotting an example of a positive or negative feedback mechanism? Explain your answer based on the description of the m
serg [7]

Answer:

Blood clothing is an example of positive feedback.

This type of feedback mechanism is useful to the body because it multiplies the factor that intervenes in clotting accelerating the process.

If a toxin affects the molecules that signal for platelets the feedback will not be effective enough to produce clotting and the body will keep bleeding.

Explanation:

Blood clotting is an example of positive feedback due to the fact that when the vascular endothelium is damaged  platelets will go to this area and activate themselves once they are in contact with the collagen fibers of the damaged structure. When the platelets are activated they will release the contents that is stored in their granules. One of the contents is a Gq-linked protein receptor cascade,  that will increase the concentration of calcium in the platelets. Calcium activates protein kinase C, which, in turn, activates phospholipase A2 (PLA2). PLA2  will modifies  an  integrin membrane  increasing its affinity to bind fibrinogen. The activated platelets change their  shape , and the fibrinogen cross-links with the integrin membrane aiding  in  the aggregation of adjacent platelets. After this the coagulation cascade takes place. there are two pathways the extrinsic  and the extrinsic one.

The extrinsic pathway will be activated due to tissular factor released  by the platelets and the intrinsic pathway will be activated due to endothelial collagen. The final product of both pathways is factor x.

Factor x will transform prothrombin into thrombin will activate the conversion of fibrinogen into fibrin. Thrombin will form a net of fibrin that will the clot.

A cascade reaction is useful because every component of the cascade are related making a quick reaction once that one of then is activated and can activate other or more factors.

If a toxin affects the molecules that signals for platelets, platelets will not go to the damaged area and in consequence there will not be thrombin and fibrin to form the clot together with platelets.

7 0
3 years ago
PLEASE HELP !! ILL GIVE 40 POINTS ; PLUS BRAINLIEST !! DONT SKIP ANSWER.
Pani-rosa [81]

Answer:

b. 10,000 plants

Explanation:

Producers, plants, contain the most stored energy in an energy pyramid.

I hope this helped :)

7 0
3 years ago
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¿puede la glicoproteina cambiar de orientación ,quedando la parte glucida hacia adentro de la celula ?
mixas84 [53]
I cannot under stand you sorry can’t help you.
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