Explanation

A hypothesis is a testable and specific explanation for a scientific observation or question.

It can be confirmed or rejected through experiments and data collection.

Explanation

A catalyst speeds up a chemical reaction without being consumed in the process.

It lowers the activation energy, allowing the reaction to occur faster.

Explanation

Water is crucial for vital biological processes like digestion, circulation, and temperature regulation.

It also acts as a solvent, transporting nutrients and waste in living organisms.

Explanation

 Lordosis refers to an excessive inward curvature of the lower spine, commonly known as "hollow back" or "swayback".

Explanation

Fertilization in frogs involves the fusion of male and female gametes — a clear example of sexual reproduction.

The budding, fission, vegetative propagation are all forms of asexual reproduction.

Explanation

Explanation

Amoeba and Paramecium are unicellular, eukaryotic organisms classified under Kingdom Protista.

They live in water and move using structures like pseudopodia (Amoeba) and cilia (Paramecium).

Explanation

• The greenhouse effect is an environmental problem caused by the increasing amount of carbon dioxide (CO2) in the atmosphere.
• Primarily due to human activities such as burning fossil fuels, deforestation, and land-use changes.
• This excess CO2 traps heat and leads to global warming and climate change.

Explanation

• A parasite is an organism that feeds and lives in or on part of another organism (host), often causing harm to the host.
• In this case, the mosquito is feeding on the human's blood, making it a parasite.

Explanation

Deforestation reduces the number of trees that absorb CO₂ and release oxygen.

This leads to higher CO₂ levels, contributing to pollution and climate change.