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katovenus [111]
4 years ago
7

The original source of all genetic variation is _____. the original source of all genetic variation is _____. sexual reproductio

n independent assortment mutation natural selection recombination
Biology
1 answer:
IceJOKER [234]4 years ago
7 0
The answer for the above question is Mutation. 
Mutations are random spontaneous changes that occur suddenly in the DNA. A single mutation can have a large effect, however in may cases evolutionary changes are based on the accumulation of many mutations. The gene flow is any movement of genes from one generation to another and is an important source of mutation 
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Whitch statement explains how producers are dependent upon consumers for their survival?
NeX [460]

Answer: Hello your answer is.....

The correct answer is: Consumers

Explanation:

Consumers produce carbon dioxide for producers to use during photosynthesis.

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6 0
3 years ago
Which element is a metaloid
Studentka2010 [4]

Answer:

Elements that are the border line of metals and non-metals.some elements near the stepped line have mixed properties of metals and non-metals these elements are called metalloid e.g. Silicon and Germanium

Explanation:

I hope this will help you:)

3 0
3 years ago
Choose 3 of your favorite animals from the Lion King and research their binomial nomenclature (scientific name) and one symbioti
qwelly [4]

Answer:

Simba , Scar and MUfasa

Explanation:

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6 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
Which diet promotes the greatest loss of body heat?
Novosadov [1.4K]

A diet that consist highly of fruits with lots of vitamin c and vegetables along with coconut water and pomegranate juice can help maintain body heat and not lead to it over heating and of course lots of cold water. Milk with a bit of honey could also help.

5 0
3 years ago
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