An energy pyramid is always related to the organisms food web. A increase in no of tropic levels could make it complex. Also the reason for only 4 or 5 is to make it simple to understand.
Answer:
Our immune system produces antibodies against that antigen of pathogen.
Explanation:
Injecting an antigen from a pathogen would help our immune system memorize the infection and protect our body from causing of the disease because our immune system produces antibodies against that antigen so when the pathogen enters our body these antibodies attack on that and prevent them of causing infection in the body so that's why injecting an antigen has to be done from the childhood to prevent diseases.
Answer:
The three main similarities between prokaryotic and eukaryotic cells are as follows-
- Both the type of cells undergoes the process of respiration
- They both require energy to carry out the various processes
- They are both comprised of distinct cell membrane.
The three main differences between prokaryotic and eukaryotic cells are as follows-
- Prokaryotic cells are comprised of circular DNA, whereas eukaryotic cells are made up of linear DNA.
- Prokaryotic cells does not contain any nucleus, whereas eukaryotic cells are comprised of a well-distinct nucleus.
- Prokaryotic cells does not contain chromosomes, whereas eukaryotic cells are comprised of chromosomes.
MRNA. Messenger Ribonucleic Acid.
