Mycorrhizae enhance plant nutrition mainly by
a. converting atmospheric nitrogen to ammonia
b. stimulating the development of root hairs
c. absorbing nutrients (and water) through the fungal hyphae
d. providing sugar to root cells, which have no chloroplasts

The answer is C. A mycorrhiza is a symbiotic association between a fungus and the roots of a vascular host plant. They colonize the roots of vascular plants connect them, one to the other; and then send out their filaments, called hyphae, as much as 200 times farther into the soil than the roots they colonize.

an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.

the answer would be knowledge about cars!