A gametophyte is a multicellular haploid that is formed from the spore. It is true that the life cycle alternates from haploid to diploid. 
        
             
        
        
        
After the macrophage fails the Helper T Cell stimulates the B cells if pathogen is extracellular and Cytotoxic T Cells if the pathogen is intracellular. Once the pathogen is killed the B Cells create Memory B Cells and the Killer T Cells create memory T Cells.
        
             
        
        
        
The source of all energy in the pyramid in model one is the hawk
        
             
        
        
        
Answer: Option E) polar
Amino acid-derived and peptide hormones are unable to diffuse across a cell membrane because they are polar 
Explanation:
Amino acid-derived and peptide hormones such as serotonin, epinephrine, dopamine etc, are unable to diffuse across a cell membrane because they consist of several repeating units of amino acids with positively charged or negatively charged side chains. 
Thus, the side chains make these hormones water-loving (hydrophilic), and impassable to the hydrophobic layer of the cell membrane.
 
        
             
        
        
        
Answer:
there is an abundance of fertile soil
climate and fertile soil are crucial for plant growth