What is the similarity between simple diffusion and facilitated diffusion?
a. both move molecules from lower concentration to higher concentration.
b. both move molecules from higher concentration to lower concentration.
c. both need energy.
d. both need transport protein.

anyone know this answer?

Which individual below would be considered heterozygous? a. dd b. dd c. dd

Acid rain throughout the northeast united states has lowered the ph of many ponds and lakes. the lowered ph will eventually result in the death of many aquatic animals. compare the map of the u. s. with the ph tolerance range for the organisms listed. based on the tolerances seen here, which aquatic organisms are least likely to survive in the northeastern states?

Angiosperms are the most successful terrestrial plants. which of the following features is unique to them and account for their success? a. fruits enclosing seeds b. wind pollination c. sperm cells without flagella d. embryos enclosed within seed coats e. dominant gametophytes