Correct Answer: B. basalt plateau

Correct Answer: C. Polyandry

Correct Answer: A. Glycerol

Correct Answer: D. purifying water

Explanation

Let's analyze each option:

• A. gauging the thickness of objects: This is a common industrial application. Radioactive isotopes (produced by nuclear reactions) emit radiation (e.g., gamma rays or beta particles) that is attenuated as it passes through a material. By measuring the amount of radiation that passes through, the thickness of the material can be determined. So, nuclear reactions (or their products) are used for this.

• B. making atomic bombs: Atomic bombs (nuclear weapons) rely on uncontrolled nuclear fission chain reactions to release immense amounts of energy. This is a direct and defining use of nuclear reactions.

• C. curing cancer: Radiation therapy for cancer uses high-energy radiation (gamma rays from radioisotopes like Cobalt-60, X-rays from linear accelerators, or particle beams) to damage and destroy cancer cells. These forms of radiation are either directly from nuclear decay or generated through processes involving high-energy particle interactions that fall under the umbrella of nuclear physics. So, nuclear reactions (or their products/related physics) are used for this.

• D. purifying water: Water purification typically involves removing a wide range of impurities, including suspended solids, dissolved chemical contaminants, heavy metals, and microorganisms.

* While gamma irradiation (from radioisotopes produced by nuclear reactions) can be used to sterilize water by killing bacteria and viruses, it does not remove chemical pollutants, dissolved salts, heavy metals, or suspended particles.

* Nuclear power plants can provide energy for desalination processes, but the nuclear reaction itself isn't purifying the water; it's simply providing the energy for a separate purification method.

* In the comprehensive sense of purifying water (removing all types of contaminants to make it potable), nuclear reactions are not directly used to remove most chemical or physical impurities.

Compared to the other options, where nuclear reactions (or their direct products) are fundamental and directly address the stated purpose, the use of nuclear reactions for comprehensive water purification is limited (mainly to sterilization) and not a primary method for removing the full spectrum of impurities.

Therefore, nuclear reactions are *not* used for purifying water in the broad sense, even if they can be used for a specific aspect like sterilization.

The final answer is D

Correct Answer: A. hydrophytes

Correct Answer: C. 6m

Correct Answer: D) ?270,000

Explanation

The process of egg formation in poultry is controlled by hormones. The egg is formed partly in the ovary and partly the oviduct. Yolk is formed In the ovary while other proteinous parts are formed in the liver and kidney. The yolk released by the ovary is taken up by infidibuIum and later moved to the oviduct where fertilization takes place The egg moves to the magnum, stay there for three hours and part of the albumen is formed. Chalaza is secreted round the yolk from the magnum. the egg moves to the isthmus where it stays for 1

Correct Answer: C. subscribed

Correct Answer: A. an abundant return from God