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MakcuM [25]
3 years ago
6

Immediately after the cells differentiate—become particular kinds of cells—they begin to form tissues. When does heart tissue fi

rst form in a human?
Biology
1 answer:
Marizza181 [45]3 years ago
5 0

Answer:

19-22 days after fertilization of egg by sperm

Explanation:

The heart is the first organ to be formed in a developing embryo. This is because it is a vital organ and responsible for the circulation of blood (with oxygen and nutrients) to the other developing tissues. It begins to be formed at around 18 days from fertilization and begins to function after day 21.  

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List the two types of viral reproduction and describe their differences. Make sure to note which one is immediately harmful to t
nadezda [96]

Answer:

The viruses replicate by lytic and lysogenic cycles

Explanation:

In the lytic cycle, viral proteins attach to the cell membrane in the host in order to release its genetic material to take advantage of the cellular host machinery and synthesize proteins to continue with the infection.  This is immediately harmful to the host.

In the lysogenic cycle, the genetic material of bacteriophage integrate into the host genome or form a circular replicon.

8 0
3 years ago
The nuclear membrane disappears during which phase of meiosis?
kykrilka [37]
A. Prophase 1
It reappears in telophase and cytokinesis.

If this is helpful, please mark me brainliest.

Thanks :)
4 0
3 years ago
What happens to the nitrogen in a rabbits body<br>when it dies<br><br>​
zepelin [54]

Answer:

When rabbit dies, the nitrogen in the rabbits body is released into the soil  by decomposition.

Explanation:  

When rabbit dies its body is decomposition takes place. Decomposition is process of breaking down of the dead remains of the plants, animals and insects into tiny pieces by free living bacteria, fungi and worms present in the environment .

During the decomposition process the nitrogen present in the dead rabbit body is released into the soil in the form of ammonia. The bacteria(nitrifying bacteria) present in the soil converts this ammonia into nitrates so that it can be again used by the plants. Now plants intakes this nitrates for photosynthesis process. This process of fixing nitrogen back into the atmosphere is called nitrogen cycle.  

8 0
4 years ago
If the pH of pure water is 7, ammonia is 12, and coffee is 5, which is acidic, which is
n200080 [17]

Answer:

acidic :- coffee

basic :- ammonia

neutral :- water

Explanation:

anything with ph value 7 is neutral.

anything with ph value less than 7 is acidic and greater than 7 is basic.

6 0
3 years ago
What is important to a scientist​
BlackZzzverrR [31]

Answer:

Their gear, depending on what kind of scientist, their lab, a team, funding, and pretty much everything else  you can think of

Explanation:

Just think about it

5 0
3 years ago
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