Most living things need oxygen to survive. You breathe in oxygen and it is carried to this organ. Here the red blood cells pick up the oxygen and carry the oxygen to all the body cells that need it. What is this organ?A) diaphragm
B) heart
C) lungs
D) trachea

Answers

Answer 1

Answer:

The correct answer would be the C) lungs.

Lungs are the pair of air-filled spongy organs.

They are mainly associated with the exchange of gases (carbon dioxide and oxygen) in the body.

The alveoli are the group of tiny air-sacs present in the lungs which form the site of gas exchange.

The oxygen from the alveolar site diffuses into the blood and carbon dioxide from the blood diffuses into the alveolar site.

The oxygen is then transported to all cells of the body with the help of circulatory system whereas carbon dioxide is removed out of the body as a part of exhaled air.

Answer 2

Answer: C) the lungs.
The air moves down the trachea and into the lungs where it is picked up by the blood

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Canada is bigger than the united states,but only has ______ as many people. 1)one-half 2)one-fourth 3)one-eighth 4)one ninth
Independent and dependent in an experiment
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Some plants that live in the desert have__________ instead of leaves to minimize evaporation

Answers

Spines/Thorns to minimize evaporation? I think that should be right from the biology I have taken.

some of the plants in the desert have thorns instead of leaves

Tailings are dangerous because they can A. release toxic elements into the groundwater or surface water.
B. decrease the amount of nonrenewable resources available.
C. be very explosive.
D. increase the chances of a volcanic eruption.

Answers

The right answer for the question that is being asked and shown above is that: "A. release toxic elements into the groundwater or surface water." Tailings are dangerous because they can release toxic elements into the groundwater or surface water.

A. release toxic elements into the groundwater or surface water.

RNA is made using the genetic instructions from DNA. What is made from the instructions in RNA?(Points : 1)
DNA

RNA

proteins

new cells

Question 2.2. Which sentence correctly describes transcription? (Points : 1)
RNA is the direct result of DNA transcription.

Proteins are the direct result of RNA transcription.

Protein transcription takes place in the nucleus of a cell.

RNA transcription takes place in the cytoplasm of a cell.

Question 3.3. What is the DNA backbone made of? (Points : 1)
a nitrogenous base and a sugar molecule

nitrogenous bases, sugar, and phosphates

sugar and phosphates

a polymer of nitrogenous bases

Question 4.4. If a segment of one strand of a DNA molecule has 500 adenine bases, how many thymine bases does the other strand have? (Points : 1)
500

250

0

You can't tell from that data.

Answers

1. Proteins

After RNA is formed, it is transported out of the nucleus and goes to the cytoplasm. From the cytoplasm, it goes into the ribosomes, where protein synthesis occurs. Together with transfer RNA (tRNA), mRNA will direct protein synthesis.

2. RNA is the direct result of DNA transcription.

Transcription is a process where DNA is transcribed into messenger RNA (mRNA). This carries all the information that will be needed to synthesize proteins.

3. Sugar and phosphates

The backbone of DNA, is made of sugar and phosphate. They form the structural framework of nucleic acids. They are arranged alternately, sugar-phosphate group-sugar and so on. The backbone refers to the sides of the DNA "ladder."

4. 500

In base pairing, guanine and cytosine pair up and adenine pairs up with thymine. Fore every adenine, there will be a thymine. If there are 500 adenine bases, there will be one for each one. So the answer is 500.

the answer of the 1st question is Proteins. (According to DNA replication and RNA process and metabolism)the answer of the 2nd question is RNA transcription takes place in the cytoplasm of a cell.the answer of the 3rd question is nitrogenous bases, sugar, and phosphates, that is proved by the sequence of each strand of DNA.the answer of the 4th question is 500 thymines, that is because each adenine bases changes to Thymine, so during DNA replication, so the number of adenine bases = number of thymines.

Plants grow taller as a result of which of the following?Adaptative growth

Primary growth

Secondary growth

Answers

I'm pretty sure it's primary growth. I might not have studied this type of biology yet, but secondary growth would definitely not be the answer.

A scientist tries to mate the two similar-looking fruit flies Drosophila melanogaster and Drosophila simulans. But he finds that they are unable to produce viable offspring. What kind of evolutionary barrier could this be?A.Chromosomal
B.Postzygotic
C.Physical

Answers

I would say that the kind of evolutionary barrier that this could be is B) postzygotic.
They can produce an offspring, but it can't be viable, meaning that it doesn't survive.

The kind of evolutionary barrier would be : B. Postzygotic

During postzygotic barrier, they do manage to produce offsprings. But that offspring do not has a fertile characteristic and tend not be able to survive and produce the next generation

hope this helps

Washing your hands frequently can prevent the spread of many vectors.