They are reactants because they are present before the reaction.
        
             
        
        
        
Answer:
D. In an ocean heated by volcanic activity
Explanation:
Most of Earth was covered in water, early organisms weren't evolved enough to walk on land at the time. There are some organisms that feed off of volcanic activity and use it as an energy resource and would adapt to the heat.
<em>"Hot spots create volcanoes on the seafloor. If these volcanoes rise above sea level to become islands, and if they occur in tropical waters, coral reefs will form on them. Since the volcanoes are cones, the reef forms in a circle around the volcano."</em>
<em>-</em><u>https://courses.lumenlearning.com/earthscience/chapter/ocean-organisms/</u>
<em>"Discovered only in 1977, hydrothermal vents are home to dozens of previously unknown species. Huge red-tipped tube worms, ghostly fish, strange shrimp with eyes on their backs and other unique species thrive in these extreme deep ocean ecosystems found near undersea volcanic chains."</em>
<em>-</em>https://ocean.si.edu/ocean-life/invertebrates/hydrothermal-vent-creatures
 
        
             
        
        
        
Adhesion depends on binding between specific molecules on both the host and pathogen so that the pathogen can gain a stable foothold on host tissues.
<h3>What is adhesion?</h3>
In epidemiology, adhesion makes reference to the process in which pathogen and host interact during an infection.
The adhesion process is fundamental to reach the survival of the pathogen during a particular infection.
These pathogens can be any type of microorganism able to cause harm to the host (e.g., bacteria and fungi).
Learn more about the adhesion process here:
brainly.com/question/15024792
 
        
             
        
        
        
 Its a 50/50 so two of there kids will have blue eyes and two will be brown eyes but the children with brown eyes with be heterozygous for blue eyes and same thing with the brown eye children 
 
        
             
        
        
        
From the med. terranian basin to the mountains of central asia.