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mart [117]
2 years ago
13

Which of the following is *true* of the placenta? Question 18 options: 1) It fully develops six months after birth. 2) It forms

during the seventh month of prenatal development. 3) It is the fluid-filled sac that houses the developing embryo and fetus. 4) It allows the exchange of nutrients between the embryo and the mother, while at the same time filtering out harmful material.
Biology
1 answer:
anastassius [24]2 years ago
6 0

Answer:

4) It allows the exchange of nutrients between the embryo and the mother, while at the same time filtering out harmful material.

Explanation:

The placenta is an organ present in all mammals. She is confirmed between the 6th and 8th week of pregnancy and has as main function the exchange of substances between the mother and the fetus. Among these substances are nutrients, gases and even secretions. The placenta also has the function of fighting infections and promoting immunity to the fetus, in addition, it can act as the lung, the intestine and the liver, while the fetus does not develop its organs.

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Write a short story about the journey of a ribosome through transcription to translation to a protein from a narrative perspective as the ribosome.

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include these vocabulary words:

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5 0
2 years ago
I need help please
algol13

Answer:

C.) Surface mixed zone

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Explanation:

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3 years ago
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A substance that influences the reaction but does not participate in the reaction is a
jekas [21]

Answer:

Explanation:

Catalyst is a substance that influences the reaction but does not participate in the reaction

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2 years ago
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Please help me i don’t understand
Eddi Din [679]
1. Biogeography, the study of the geographic distribution of plants, animals, and other forms of life. It is concerned not only with habitation patterns but also with the factors responsible for variations in distribution.

2. weathering and other natural forces break down the substrate, rock, enough for the establishment of certain hearty plants and lichens with few soil requirements, known as pioneer species. These species help to further break down the mineral-rich lava into soil where other, less hardy species can grow and eventually replace the pioneer species. In addition, as these early species grow and die, they add to an ever-growing layer of decomposing organic material and contribute to soil formation. This process repeats multiple times during succession. At each stage, new species move into an area, often due to changes to the environment made by the preceding species, and may replace their predecessors. At some point, the community may reach a relatively stable state and stop changing in composition. However, it's unclear if there is always—or even usually—a stable endpoint to succession.

3. I don’t have the video so I’m going to take. Wild guess. Just look up types of finches

4. Broadly speaking, different species are unable to interbreed and produce healthy, fertile offspring due to barriers called mechanisms of reproductive isolation.
These barriers can be split into two categories based on when they act: prezygotic and postzygotic.

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6 0
3 years ago
Some species of nitrogen-fixing bacteria have adapted to grow in nodules of legumes such as peas and clover. These bacteria make
PilotLPTM [1.2K]

Answer:

Mutualism

Explanation:

Mutualism: is a relationship between individuals of different species in which both individuals benefit from each other without causing no harm. Example is the nitrogen-fixing bacteria and plants.

8 0
3 years ago
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