Answer:
a transmembrane protein
Explanation:
A transmembrane protein spans the phospholipid bilayer one or more times. they are made of amphiphilic phospholipids: phospholipids with a hydrophilic phosphate head and a hydrophobic tail with two fatty acid chains. 
 
        
             
        
        
        
Answer:
C) reception, transduction, and response
Explanation:
Plant signaling means that information is conveyed from receptor systems to effectors within and between plant cells.
Signals can be of chemical form or electrical form.
Plant responses to internal and external signals take place in the following sequence:
Reception
Transduction
Response
So, option C) is correct
 
        
             
        
        
        
Sometimes they're used as drugs. The classic example might be penicillin, a compound made by a fungus and used as the first widely-available antibiotic.
        
                    
             
        
        
        
Limiting factors are resources or other factors in the environment that can lower the population growth rate. Limiting factors include a low food supply and lack of space. Limiting factors can lower birth rates, increase death rates, or lead to emigration.