two hydrogen bonds are formed between adenine and thymine
If you do not have variations to be selected by natural or sexual selection on their superior abilities to survive and reproduce successfully then nothing can be naturally selected against the immediate environment.
Monohybrid cross
monohybrid cross
Diversity is produced by mutation, it is what causes life to have advantages or disadvantages, and thus allow survival of the fittest to choose which mutation is the best suited for it's environment.
Answer:
The proteins receive electrical signals from nerve cells.
Explanation: