The mechanism for evolution is natural selection
Answer:
I'd say the Barometer.
Explanation:
Because it determines what front is approaching resulting in the weather forecast.
TRNA take amino acids to the ribosome.
Electrons have a negative charge so when a element looses its electrons it will have a positive charge
Answer:
for example down syndrome or trisomy 21 is a common genetic disorder that occurs when a person has 3 copies of chromosome 21 there are many other promotional abnormality is including tunnel syndrome klinefelter syndrome
