Moon...? idk ;~;... I'm pretty sure the moon is one of the focal points.
        
                    
             
        
        
        
Answer:a) a sturdy-finned, shallow-water lobe-fin whose appendages had skeletal supports similar to those of terrestrial vertebrates.
Explanation:
An ancestor - An earlier type of a species at any distant time — a progenitor.
A tetrapod is any vertebrate with four limbs. It includes any vertebrate (such as birds or snakes) that have evolved from early tetrapods — especially all members of the superclass Tetrapoda.
The presence of bones that support the appendages in Lobe – fin fish were found to be similar to the categorical skeletal supports found in the limbs of sample tetrapods. The sub class crossopterygii includes the Lobe – fin fish, which is seen as one of the recent common ancestor of living tetrapod today.
 
        
             
        
        
        
Answer:
D. ususally very abundant in an ecosystem
Explanation:
Most commercial phosphorus is produced by mining and heating calcium phosphate. Phosphorus is the eleventh most abundant element in the Earth's crust
 
        
             
        
        
        
False, Darwin was just the most famous one to do it.
        
             
        
        
        
Answer:
B) Mercury orbits much closer than Jupiter, so it feels the Sun's gravity more intensely.
Explanation: