All except number 2. Hope this helps!
Lively is your answer.
Hope this helped! (:
In observing, we have our 5 senses (smell, taste, touch, see, hear) meaning scientists uses their 5 senses to be able to have a prediction or a hypothesis about the problem.
Answer:
As the wave moves to and fro so the total distance will be d=2x5=10 m
we have
time (t) = 5 s
hence velocity will be =2 m/s
<em>D</em> is best for classifying an animal of any kind