Explanation

The nervous system is a complex network of nerves and cells that carry messages to and from the brain and spinal cord to various parts of the body.

Explanation

The velocity of sound in air at sea level under standard conditions (around 15°C or 59°F) is approximately 343 meters per second (m/s)

The speeds of sound in different materials:

• Air: 343 m/s
• Water: 1433 m/s
• Wood: 3300-3600 m/s
• Brick: 4176 m/s
• Steel: 6100 m/s
• Diamond: 12000 m/s

Explanation

• A food web is a network of multiple food chains that overlap and connect.
• It showing the complex feeding relationships between different species in an ecosystem.
• It's a web-like structure that illustrates the various pathways that energy and nutrients flow through the ecosystem.

Explanation

The food chain is the sequence of energy transfer from:

• Producers (plants, algae, phytoplankton) →
• Consumers (herbivores, carnivores, omnivores) →
• Decomposers (fungi, bacteria, insects)

This energy transfer is also known as the energy flow or trophic cascade.

Explanation

• Deserts are areas with very low rainfall, typically less than 25 centimeters (10 inches) per year.
• It resulting in a barren and often sandy landscape with limited vegetation and wildlife.

Explanation

• Grasslands, also known as prairies or savannas, are areas with lower rainfall than forests, typically between 50-200 mm annually.
• This lower rainfall doesn't support the growth of trees, but instead favors grasses and other herbaceous plants.

Explanation

• A land with high rainfall, typically between 250 to 450 mm annually, is a forest.
• Forests are areas with high vegetation density, and the abundant rainfall supports the growth of a diverse range of plant and tree species.

Explanation

• An ecosystem includes all the living components (biotic factors) like plants, animals, and microorganisms, and non-living components (abiotic factors).
• Like soil, water, air, and sunlight, interacting with each other.

Explanation

• Marine water is water that contains a high amount of salt, typically above 30% salinity.
• This includes oceans, seas, and other saltwater bodies.

Explanation

• Sperms fuse with eggs to form a zygote, which is the single cell that results from fertilization.
• The zygote then develops into an embryo, and later a fetus, as it grows and matures.