18

Greenhouse gases are trapped and build up in the atmosphere near the earth’s surface. This makes the earth warmer than normal. The warning effect of the trapped greenhouse gases causes changes in the weather patterns on a global scale. Rainfall pattern changes, sea level rises and droughts prevail.

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The study of the science of society, known as sociology, is significant — an important cog in the wheel of civilization’s history. Its development over the years has become a coalescing factor, determining relationships of national and global importance.

29

Endocrine glands are also known as ductless glands. They secrete hormones directly into the bloodstream. The endocrine glands I in both males and females are the same except for the testis (male) and the ovary (female). The majority of endocrine glands are controlled by the pituitary gland but some are stimulated by the nervous system or by chemical substances.

24

Variation gives rise to variety, diversity and uniqueness in organisms. Variation enables organisms to adapt and survive in the changing environment. This allows the organisms to breed and pass these adaptations to the next generation. Variation helps to prevent the complete extinction of animals and plants species.

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On artificial intelligence, and whether or not machines/computers can truly know anything.