A Variety of instruments is needed to measure the change in the climate system because of B. The climate system involves several different factors that are measured  differently
For example Wind and Temperature. Both of these factors will heavily affect the climate system but both these factors are so different and they need different instruments to be measured
 
        
             
        
        
        
The concept of the struggle for existence<span> concerns the competition or battle for resources needed to live. It can refer to human society, or to organisms in nature. The concept is ancient, and the term </span>struggle for existence<span> was in use by the end of the 18th century. From the 17th century onwards the concept was associated with a population exceeding resources.
Hope this helped!
STSN</span>
        
             
        
        
        
Hnrndkc HD end djd HD did djdjd did did didndidjdi
 
        
             
        
        
        
Answer:
They are organisms (individual organisms called "plankters") that live in large bodies of water.
Explanation:
They reside in large bodies of water (oceans, lakes, etc). They are usually abundant in surface waters because all ecosystems of plankton live off input of solar energy. 
 
        
             
        
        
        
Answer:
I think that the second picture was correct 
Explanation:
gravitational field is a model used to explain the influence that a massive body extends into the space around itself, producing a force on another massive body. Thus, a gravitational field is used to explain gravitational phenomena, and is measured in newtons per kilogram (N/kg)