Answer:
Pacemaker cells are located in the <u>sinoatrial node.</u>
Contractile cells are located in the <u>Heart</u>
Explanation:
They consist of double-bond and single bond, according to the type of DNA.
I did some research to find out what the options were and if these are the correct options;
<span>A) adipose
</span>B) brain
C) cardiac
<span>D) muscle
The correct answer would be letter "B" please leave a rating and a like if this helped you! :)</span>
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Answer:
Every living organism starts with a cell which is the fundamental units of life, an organism could be unicellular or multicellular depending on the complexity. The aggregation of cells forms tissue, the tissue makes the organ while the organ makes the entire system which forms the entire living organism.
Explanation:
cell
tissue
organ
system
