What is the basic unit of life

I) The organisms which has only one cell in their body are called Unicellular organisms

for ex - Amoeba , Paramecium

ii) The organisms which have more than one cell in their body are called Multicellular organisms

for ex - Humans , Animals

All cell have some similar structure

I) Nucleus

ii) Cytoplasm

iii) Organelle

Iv) Cell membrane

Plant cell - Have cell wall

Large vacuole

Chloroplast

Animal cell - Lack cell wall and chloroplast , Have small vacuole

The body size of an organisms depend upon no. of cell and not on the volume

Cell --- ) Tissues ----) Organs ----) Organ system ----) Organisms

age range would be the answer