To the best of my knowledge, a cairn is a pile of stones. They are used all over the world as marks for graves, passages, or settlements. These cairns have no relationship to animals or biological diversity.
Mechanical waves require a medium for their propagation whereas electromagnetic waves require a medium for their propagation.
All biological activities require energy?
Plants do not have a known biological need for titanium, but some plants can accumulate trace amounts of titanium from the soil. Animals do not require titanium for biological functions, but some marine organisms can incorporate titanium into their shells or skeletons.
Electromagnetic waves, such as light and radio waves, do not require a material medium for their propagation. They can travel through a vacuum because they are created by oscillating electric and magnetic fields. This is in contrast to mechanical waves, like sound waves, which require a medium such as air or water to propagate.
Rootkit
Most animals in the kingdom Animalia are aerobic, meaning they require oxygen to survive. Oxygen is essential for cellular respiration, which provides the energy needed for various biological processes in animals.
One disadvantage of vegetative propagation is that it can lead to a loss of genetic diversity within a population, making the plants more susceptible to diseases and environmental changes. Additionally, some methods of vegetative propagation, such as cuttings or grafting, can be labor-intensive and require specific skills and resources.
generally electromagnetic wave does not require any medium while sound waves require a medium (air) for propagation
All living organisms require water to survive. This includes plants, animals, fungi, and microorganisms. Water is essential for carrying out various biological processes such as metabolism, nutrition, and reproduction.
A Sound wave, water wave, earth quake wave. Electromagnetic waves (radio, light, etc.) do not require a medium for propagation.
Sexual propagation involves the fusion of male and female gametes to create offspring with genetic diversity, while asexual propagation involves producing offspring without the need for gamete fusion, resulting in genetically identical offspring to the parent plant.
Electromagnetic waves (like light) don't require a medium for propagation, unlike mechanic waves (like sound).