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mr_godi [17]
2 years ago
9

What are weeds??????​

Biology
1 answer:
Mars2501 [29]2 years ago
5 0

The undesirable and unwanted plant which grow naturally along with crop are called weeds.

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2. Are viruses alive? Why or why not?
drek231 [11]

Answer:

Yes.

Explanation:

A virus is a dangerous cell. And cells are alive. The nucleus in the cell gives it it's "life" by controlling what the cell does at all times. The nucleus is like our brain or heart, you could say,

3 0
3 years ago
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Why are vaccines not convenient for everyone?
solong [7]
Certain vaccines are live which means they are putting the actual virus into the patient thought the injection. This means people who are immune compromised can’t have these because they will get very sick. This is the only way I know how to answer
8 0
3 years ago
Gas exchange is a primary example of simple diffusion, the exchange of _________ & __________ fuels the cellular processes s
Elena L [17]

gas exchange is a primary example of simple diffusion,the exchange of *oxygen* and *carbon dioxide* fuels the cellular processes such as photosynthesis and cellular respiration

4 0
3 years ago
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Different forms of a given gene are known as
yulyashka [42]

Answer: alleles

Explanation:

Alleles are different forms of a given gene. Alleles are mutated forms of a given gene which controls a particular trait. For instance, the gene that codes for hemoglobin is denoted with the letter A but the gene has another variant denoted by S. In abnormal hemoglobin S (sickle hemoglobin), glutamate is replaced by valine at position 6 in the amino acid sequence of the two beta chains of hemoglobin. This change in the amino acid sequence causes the red blood cells to have a sickle shape resulting in sickle cell disease. Therefore hemoglobin A and S are alleles of a given gene.

6 0
3 years ago
Stromatolites are rocky structures that generally form in shallow waters from the binding of sediment by microbial biofilms. Str
hjlf

<u>Answer:</u>

Approximately, the oldest stromatolites are 3.6 billion years old on earth.

<u>Explanation:</u>

  • Stromatolites is not only oldest earths fossil but conspiracy in that they are singular visual portal in deep time on earth.
  • It is defined as laminated accumulation structure that is they stick up above sea floor .
  • Stromatolite buildings includes oldest fossils which are 3.5 billions old when the earth were too unfriendly to support life.
  • The study of  fossil age, evolutionary, method of formation are known as paleontology.
  • These specimens are considered as old fossils which are around 3.4 to 4.1 billions years old.
7 0
3 years ago
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