Carbon dioxide
this is the answer
An irregularly occurring and complex series of climatic changes affecting the equatorial pacific region and beyond every few years, characterized by the appearance of unusually warm, nutrient-poor water off northern Peru and Ecuador, typically in late December
D - an increase in tree cover in the tundra.
Permanent tissue is composed of cells that have lost the ability to divide and has attained a definite shape or form.
There are three main types of permanent tissue. 1) simple, 2)complex, 3) special tissues.
