Which of the following is not a trait of mangrove trees?
a.
they excrete salt through their leaves.
b.
they do not tolerate highly saline environments.
c.
thy have two types of specialized roots.
d.
they absorb oxygen through their roots.

b.They do not tolerate highly saline environments.

Mangroves are salt tolerant short trees that grows in coastal regions. They grow in extreme brackish or saline water. Therefore, they are called as halophiles. They exhibit a complex salt filtration system to remove out excess salt. They have two types of specialized roots systems they are impermeable to sodium salts. These roots contains suberin in order to decrease salt intake along with water. Salt which gets accumulated in the shoots is transferred to leaves which shed in old age. Hence, they excrete salts through leaves. They have stilt roots which are grown on the surface of soil.These roots have pores on their bark which allows the absorption of oxygen from the atmosphere.  

the most speciallized is b. grizzly bear