Answer:
Over time tadpoles can grow their tails longer and deeper if there are numerous predators, allowing them to swim faster and look bigger.
(mangrove) Two key adaptations they have are the ability to survive in soaked soil and no oxygen soil, and they have the ability to tolerate slightly salty waters.
Explanation:
The answer is -4 while the element is chlorine
Cos(2θ) = cos²θ - sin²θ = (1-sin²θ)-sin²θ = 1-2(7/9)^2 = -17/81
