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How does the process of photosynthesis contribute to the production of oxygen in plants?

What is meant solar system? 

How many components has ecosystem?

A gas is compressed at a constant pressure of 0.800atm from 9.00 L to 2.00 L 400 J of energy leaves the gas by heat.

(a) What is the work done on the gas?

(b) What is the change in its internal energy?

(a) Sketch a function that satis?es the following conditions: At x = ?1 the derivative is zero and the second derivative is positive. At x = 3 the ?rst and the second derivatives are both zero.

(b) Find a polynomial that satis?es the conditions give above.

(c) If you add a constant value to the polynomial, would the new polynomial still satisfy the required conditions? Justify your answer mathematically.

Find the derivative of the polynomial;  

What is diapedesis?

Which part of trees are normally use for timber