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Dafna11 [192]
3 years ago
5

Urgent. will mark brainiest. Explain what happens in the nervous system when your finger is hurt. Please actually answer!

Biology
1 answer:
Nostrana [21]3 years ago
6 0
Motor neurones are activated and the muscles of your arm contract, moving your hand away from the sharp object.
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Which of the following is an example of an organ in a plant?
Ilia_Sergeevich [38]

Answer:

As I think Option C is the correct one.

Explanation:

External plant structures such as leaves, stems, roots, flowers, fruits, and seeds are known as plant organs. Each organ is an organized group of tissues that works together to perform a specific function.

4 0
3 years ago
A point mutation changes the Dna sequence cga to cgt but the same protein is produced which point mutation occured
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It would be C because it didn't change what amino acid it was
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Name two types of evidence used to support the theory of evolution. explain how scientist use each type of evidence to provide s
joja [24]

Answer:

There are many types of evidence which support the theory of evolution such as comparative anatomy, fossil records, phylogenetic relationship, embryology et cetera

Comparative anatomy includes homologous organs and analogous organs. They support divergent and convergent evolution respectively.  

For example, the homologous structure of limb of humans, birds, bat, horse, whale et cetera show that they are made up of the same set of bones which are humerus, radius, ulna, carpals, metacarpals, and phalanges.  

It shows divergent evolution and supports that these organisms have evolved from a common ancestor.

Embryological evidence: When early stages of embryological development of different organisms are compared, it is found that these stages are similar at different levels of development.

For example:

  • The appearance of pharyngeal-arch (gill-like structures) in vertebrates during embryo development.
  • Salamanders and terrestrial frogs pass through larval stages within an egg. They possess the features similar to aquatic larvae, however, when they hatched out the eggs being ready for life on land.
3 0
3 years ago
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True or False: In human beings, fertilization occurs externally.
MariettaO [177]

Answer:

False.

Explanation: Fertilization is a process in sperm cell combine with egg cell.

In human beings, fertilization occurs internally. During fertilization, sperm of male combine with egg of female inside the female body which changes into zygote. After sometime, zygote turns into a new baby. About nine months, the baby comes out from the body of female.

6 0
4 years ago
Explain how the reduction in biodiversity can affect the eco logical balance in the dam
djverab [1.8K]

<span>Ecological balance can be defined as the equilibrium or stability of species (animals and plants) to natural conditions or environment. A decrease in the variety or diversity of, environment or those natural conditions which may result in an imbalance or instability of the ecological balance means a reduction in biodiversity.</span>

5 0
3 years ago
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