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UNO [17]
3 years ago
8

Which of the following are chemical changes? Select all correct

Biology
1 answer:
yan [13]3 years ago
5 0

Answer:

D and E

Explanation:

The others are physical methods and can be separated again.

Hope this helps :)

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Why is the unit of velocity called derived unit?​
Karolina [17]

Answer:

Because it is a vector quantity, it has a direction too such that derived unit is made up of two or more fundamental units. That is mere and second. That is why it is called as a derived unit as its unit is metres per second.

Hope this helps...Have a good day!!

7 0
2 years ago
Prokaryotic bacteria are surrounded by a ____________ that contains the ____________ to regulate the entry and exit of materials
lukranit [14]

Prokaryotic bacteria are surrounded by a cell membrane that contains the transport proteins to regulate the entry and exit of materials through the cell, the cell wall to help maintain cell shape and structure, and the capsule, which aids against drying out and protects bacteria from a host's immune system.

<h3><u>Explanation:</u></h3>

Bacteria are the prokaryotic organisms that are found in every part of Earth. These organisms do have an interesting ultrastructure. The coverings of the bacteria are three in layer. They are

A. The outer capsule.

B. The middle cell wall.

C. The inner cell membrane.

The capsule is the outermost covering of bacteria that is formed of different slimy materials. These materials contains hygroscopic substances which can absorb water from the surroundings even when the water concentration in outside is very very low. This layer of protection outside bacteria help them to protect themselves against drying out at dry conditions.

The middle cell wall is formed of polymers of N acetyl glucosamine and N acetyl muramic acid. This layer is chitin in nature and is strong enough to maintain the shape and size of bacteria irrespective of outer conditions.

The innermost layer of bacteria is cell membrane which is formed of proteins and lipids bilayer and this cell membrane contains different transport for proteins which help in transport of different substances like water and nutrients inside the cell by means of active transport or passive diffusion.

6 0
3 years ago
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Once a true cell was formed, biological evolution began. biological evolution is all the changes that have occurred in living th
Over [174]

Hello there
The answer is Living things have all evolved from a common ancestor.


Hope this helps
Best Regards Queen Z

3 0
3 years ago
Melissa tested how fast sound waves travel through different media. She then ordered the speed at which the sound traveled throu
dybincka [34]

Fastest Speed: Steel

Medium Speed: Water

Slowest Speed: Air

6 0
2 years ago
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________ predicted that population would outpace the food supply.
Harman [31]
Thomas Malthus was an English scholar and cleric who was known for his views in political science and demography (study of population). His views suggested that population would outpace food the supply of food and that the only vital parameters of population growth were famine, war and diseases. His writings on demography were influential in shaping the economic thinking.
7 0
3 years ago
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