Answer:
geologists use rock samples and direct evidence to prove what earth's structure is like.
Explanation:
 
        
             
        
        
        
Answer:
I will give a hypothesis. Just like a tree, when you cut a tree by its trunk, you will the rings. The rings around it represents the tree's age. So when you cut rock, the pores in the rock determine whether it is an old rock or a fossil rock.
Explanation:
 The reason is, if it is limestone and it is an old rock, the pores will be slightly big and if the limestone is a fossil rock, then the pores will be bigger due to leaching or denaturing of the minerals in the rock through the ages.
 
        
             
        
        
        
Answer:
1.
Explanation:
A signal from one gland to another would not be intercellular, as "inter" means inside. This means intercellular would stand for "Inside the Cell"
 
        
             
        
        
        
The answer is greenhouse effect
        
             
        
        
        
Sand dunes or desert pavement