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Nezavi [6.7K]
3 years ago
13

Which of the following is a response to an external stimulus?

Biology
2 answers:
yuradex [85]3 years ago
6 0

Answer:

i think that the correct answer would be A

Explanation:

hope this helps

san4es73 [151]3 years ago
6 0

Answer:

I play free fire at night and I will play free fire with my friends

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What landform is created when 1 oceanic plate and 1 continental plate move apart at a Divergent Boundary?
Inessa [10]

Answer:

Divergent boundaries also form volcanic islands, which occur when the plates move apart to produce gaps that molten lava rises to fill. Current research indicates that complex convection within the Earth's mantle allows material to rise to the base of the lithosphere beneath each divergent plate boundary.

8 0
3 years ago
In the image of the food chain below the ____ is the producer.
fiasKO [112]
Plant is a producer
8 0
3 years ago
Compare and contrast the circulatory system of animals and plants. Show five differances .
Paha777 [63]

Animal’s and Plant's circulatory system:

1. Animals have circulatory system for the transport of nutrients and waste and plants have vascular system for the exchange of gases and nutrient.

2. Animals have specialized circulatory systems like.ARTERIES,VEINS and CAPILLARIES.

3. IN PLANTS, they have bidirectional transport system…like FOOD prepared though PHOTOSYNTHESIS is transported to different parts of plant body through phloem..while minerals and water intake by roots r transported by xylem..

4. ANIMALS circulatory system works on presence of amount of blood.

5. PLANTS circulatory system works on availability OF resources.


7 0
3 years ago
Describe one observation that supports the theory that mitochondria and chloroplasts originated as independent prokaryotic organ
olga nikolaevna [1]

Answer:

  • Both organelles present their genetic material.
  • Both organelles divide by binary fission
  • Both organelles present a double membrane, the internal one looks identical to the bacterial membrane, while the external membrane looks like the eukaryotic one.
  • In the internal membrane are placed the energy centers, just as it occurs in bacterias membrane.
  • The sizes of the organelles are similar to the size of some procaryotes

Explanation:

The endosymbiotic theory essentially states that some organules of the eukaryotic cells, such as mitochondria and chloroplasts, were once free-living bacteria. Probably, these organisms must have been phagocytized but not digested by another cell. These bacteria were able to adapt to their host, establishing a bond of dependence among each other.

Both organelles have many similarities with other free-living bacteria. For this reason, the theory states that chloroplasts derivate from cyanobacteria (because they both absorb sunlight, store the energy in ATP, and produce organic molecules) and that mitochondria derivate from rickettsias (because they produce ATP in the same way, by using the Krebs Cycle and Oxidative Phosphorylation).

This theory is supported by a few characteristics of the chloroplasts and mitochondria that suggest that they once were free cells. For example,

  • Both organelles present their genetic material. This DNI is independent of the cells´ DNA, is bi-catenary and circular, identical to the bacterial DNA, and very different from the one of the eukaryotic cells.
  • Both organelles divide by binary fission, not by mitosis, and can synthesize their ribosomes and organelles.
  • Both organelles present a double membrane, a characteristic that reinforces the idea of being phagocyted. The internal membrane looks identical to the bacterial membrane, while the external membrane looks like the eukaryotic one.
  • In fact, in this internal membrane are placed the energy centers, just as it occurs in bacterias membrane.
  • Finally, the sizes of the organelles are similar to the size of some procaryotes

3 0
3 years ago
Timothy is in his 60s. he has suffered from a psychotic disorder his entire life but the symptoms of the disorder have lessened
SCORPION-xisa [38]
<span>Timothy most likely suffered from schizophrenia. The symptoms of psychotic disorder correlate with the symptoms of schizophrenia. Clinical psychology helps with treatment through talking while neurologist treat through brain surgeries.</span>
5 0
3 years ago
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