Answer:
D: Nonpolar covalent bonds involve two atoms that have equal electonegativity whereas polar covalent bonds involve two atoms that are unequal in their electronegativity.
Explanation:
 
        
                    
             
        
        
        
Smilus dramaticus: All of the Duchotomous keys one smiles :)
 .Smilus upsettus
 Smilus saddus
 Smilus winkus
 Smilus Saddest
 Smilus piratus
 Smilus valentinus
 Smilus suprisus
 Smilus toothyus
 Smilus traditionalis
        
             
        
        
        
Here are the answers. 
1.	Runoff from the land in a <em>stream’s watershed</em>……….
2.	And water from its <em>tributaries</em>.
3.	At the stream’s headwaters, the <em>gradient</em>………..
4.	The greater the water speed, the larger the <em>stream load</em>………..
5.	Which is made up of: a) <em>suspended load</em>, b) <em>dissolved load</em>, c) <em>bed load</em>
6.	Under these conditions a <em>braided stream</em> may form
7. Where gradient flattens, a <em>meander</em> may form
 
        
             
        
        
        
<span>In liver, the most intensively studied transmembrane and intracellular signal transduction pathways are the Janus kinase signal transduction pathway, the mitogen-activated protein kinases signal transduction pathway, the transforming growth factor β signal transduction pathway, the tumor necrosis factor α signal transduction pathway and the recently discovered sphingolipid signal transduction pathway. All of them are activated by many different cytokines and growth factors. They regulate specific cell mechanisms such as hepatocytes proliferation, growth, differentiation, adhesion, apoptosis, and synthesis and degradation of the extracellular matrix. The replication cycle of hepatitis C virus (HCV) is intracellular and requires signal </span>
        
             
        
        
        
Explanation:
A cell's lipid bilayer allows to small uncharged substances such as: ions, hydrophobic molecules, oxygen and carbone dioxide to travel through the membrane by simple diffusion