At 15.6 million degrees celcius, the temperature of the sun's core is high enough for nuclear to occur.

At 15.6 million degrees Celsius. the temperature of the sun's core is high enough for nuclear "fusion" to occur. Nuclear fusion is known to be the reaction in which two or more atomic nuclei comes close enough to form one or many different atomic nuclei and subatomic particles.

c) Xylem and phloem are the examples.

Explanation:

Complex tissues help in the transportation of organic material, water, and minerals up and down the plants. That is why it is also known as conducting and vascular tissue. The common types of complex permanent tissue are: Xylem and phloem .