A helical coil is a structure formed by winding a flexible material, like a tube or wire, into a spiral shape. It is commonly used in heat exchangers and other fluid systems.
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Photosynthesis is the process by which plants, algae, and some bacteria convert sunlight into energy, producing glucose and oxygen from carbon dioxide and water in chloroplasts.
DDT (dichlorodiphenyltrichloroethane) is a synthetic pesticide once widely used to control insect-borne diseases like malaria. Its environmental persistence and harmful effects led to bans in many countries.
Chromosomes are thread-like structures in cells containing DNA. They carry genetic information, determining an organism’s traits. Humans have 23 pairs, with one set inherited from each parent.
Male gamete (sperm) is small, mobile, and contributes genetic material. Female gamete (egg) is larger, non-motile, and provides nutrients. Fusion during fertilization forms a zygote, initiating development.