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dem82 [27]
3 years ago
5

Simple, prokaryotic organisms have been on Earth for over 3 billion years and have been able to grow and evolve into many differ

ent and successful prokaryotic organisms. Which structure evolved in cells approximately one billion years ago that allowed for the forming of more complex, multicellular organisms?
A) nucleus

B) ribosome

C) plasma membrane

D) golgi apparatus
Biology
2 answers:
mrs_skeptik [129]3 years ago
6 0

A) The nucleus is the answer

astraxan [27]3 years ago
6 0

Answer:

The correct answer is option A: the nucleus, a fundamental part of the eukaryotic cell.

Explanation:

Hello!

Let's solve this!

First we will analyze what each of the structures is.

A) nucleus: main structure of a eukaryotic cell. The nucleus contains the DNA inside.

B) Ribosome: they play a fundamental role in protein synthesis.

C) plasma membrane: it is the membrane that surrounds the cell. It is semipermeable, it means that it lets in some substances that are good for the cell and does not let harmful substances pass.

D) Golgi apparatus: helps the synthesis of lipids.

After the analysis, we conclude that the correct answer is option A: the nucleus, a fundamental part of the eukaryotic cell.

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Costa Rica, located in Central America, features a very high level of biodiversity due to its tropical climate and large range o
maxonik [38]

Answer:

The interaction between the sloths and the leaves they eat is an example of a<u> predator-prey</u> relationship. In this example, sloths are <u>herbivores</u> that acquire their nutrients and energy from the<u> plants</u> they eat. The colors of coral snakes provide these animals with <u>mimicry</u> to avoid predation. Specifically, their coloration helps them <u>advertise their toxicity.</u> The interaction between the hosts and the ticks that live on them can be characterized as <u>parasitism</u>, because <u>one species feeds on the other</u>.

Explanation:

Predator-prey relationships are those in which a specie feeds on another specie. The sloth is the predator that feeds on the leaves which are its prey. Herbivores feed on plants. Therefore, the sloth are rightly classified as herbivores.

Coral snakes are brightly colored with red, yellow, and black patches that warn potential predators of their toxicity. Ticks living on hosts are parasitic because the ticks feed on their host.

8 0
3 years ago
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iren2701 [21]
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Patent Ductus Arteriosus, is what happens when that vessel does not close. While not as dangerous as other congenital defects. However, because there is still a bypass, blood that normally need to be oxygenated by going through the pulmonary arteries to the lungs, can be diverted and placed into the blood stream without vital oxygen. This condition may eventually lead to CHF (congestive Heart Failure) and Pulmonary Hypertension if not treated.
6 0
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PLSS HELP
densk [106]

Explanation:

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3 years ago
Interneurons receiving input from sensory neurons are located in the ________.
alisha [4.7K]

Answer:

Dorsal horn

Explanation:

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The dorsal horns are located at each spinal cord levels that are four in number. The sensory nuclei is present in dorsal horns that perceive somatosensory information. The information is then transferred to midbrain and diencephalon. Thus, Interneurons receiving input from sensory neurons are located in the dorsal horn.

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