Answer:
Option D, Zinc is higher on the activity series because there is clear evidence of a reaction.
Explanation:
It is very clear that a metal which is higher in activity will replace a metal having lower activity.  
Since, Zinc has higher activity than copper, it is very sure that it in a copper chloride solution it will replace copper and produce zinc chloride solution leaving behind copper as residue.  
Residues of copper is a clear evidence of reaction  
The chemical equation for this reaction would be -
 
Hence, option D is correct
 
        
             
        
        
        
Answer: The systems regulate the house, the same way our body system helps regulate our body. If it wasn’t for the electrical system, plumbing system, heating, and cooling system the house wouldn’t be regulated or able to live in. Just like if our bodies isn’t being regulated, we can't live. 
I hope this could help you! ^^
        
             
        
        
        
I believe the answer to your question is isokinetic, isometric, and isotonic
 
        
             
        
        
        
Answer:
Using the number of amino acid differences, it would appear that the two birds are more closely related (had a common ancestor very recently), while the two fungi would have to trace their common ancestry much farther back in time (much more distantly related). 
 
        
             
        
        
        
Answer: 
4 × 10^0 kg or 4×E0 kg.
Explanation:
Before delving into or solving the Calculation, let us check one or two things about worker bees. 
WHAT IS A WORKER BEE?. 
Bees generally are social insects living in an organized community and they consist of three castes which include; the drone bees, worker bees, and the queen bees. 
The queen bees are the female bees while the drone bees are the male bees.
The WORKER BEES are female bees too, but the only difference between them and the queen bees is that they (worker bees) do not reproduce like the queen bees. They are saddled with the responsibility of looking for food and maintaining the hive temperature.
Now to the question, the mass of a bee= 1 × 10^-4 kg. And there are 4 × 10^4 bees in hive. Therefore, the mass of all the worker bees in the hive together = (1 × 10^-4) × (4×10^4). 
==> 4 × 10^0 kg, or 4E0 kg.