The most likely cause of the observed variation is adaptation and evolution
Answer:
Selective breeding or it's Animal husbendary
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They both contain a cell membrane and cytoplasm.
The information that can be used to determine an atom's identity is the number of protons.
<h3>What is the proton number? </h3>
The proton number of an atom is the number of positively charged particles in the core of the atom.
The number of protons is always equal to the number of electrons for every neutral atom.
Thus, the proton number is the primary characteristic that can be used to determine the identity of an element.
More on proton numbers can be found here: brainly.com/question/8178466
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Answer: RBCs
Hemoglobin is the iron pigment in red blood cells that helps the RBCs carry oxygen to the cells.