Explanation

• Thymine is a pyrimidine nitrogenous base found in DNA.
• But normally absent in RNA, where uracil takes its place.
• The two pyrimidine bases in RNA are uracil (U) and cytosine (C).
• Adenine (A) and guanine (G) are purine bases found in both DNA and RNA.
• DNA contains A, T, G, C.
• RNA contains A, U, G, C.

Last verified on 25-10-2026

Explanation

• Synecology is the branch of ecology that studies groups of organisms or communities and their relationships with the environment.
• It examines interactions among different species, such as competition, predation, and mutualism.

Additional information:

• Autecology studies an individual organism or a single species in relation to its environment.

Last verified on 01-11-2026

Explanation

• Density is the mass per unit volume of a substance.
• Density is calculated by dividing the mass of a substance by its volume.
• The SI unit of density is kilogram per cubic metre (kg/m³).

Last verified on 25-10-2026

Explanation

• A scalar quantity has magnitude only and no direction.
• Speed tells us how fast an object moves, without specifying its direction.

Additional information:

• Velocity, acceleration, and force are vector quantities because they have both magnitude and direction.

Last verified on 31-10-2026

Explanation

• Mechanics is the branch of physics that studies the motion of objects and the forces acting on them.
• It includes kinematics (motion without considering forces) and dynamics (motion and its causes).
• Statics studies objects in equilibrium.

Last verified on 31-10-2026