cloning
growing a plant or animal from one cell of its parent
Some scientists think that cloning fruits and vegetables can help end world hunger.
photo credit: singkam/Shutterstock
cell
a tiny, basic part of a plant or animal; all living things are made up of cells
You need a strong microscope to see the cell of a bean.
photo credit: De Agostini Picture library/Getty
embryo
an unborn human or animal in the earliest stages of growth
We studied how a chick grows inside an egg, from when it’s an embryo to when it hatches.
photo credit: Anneka/Shutterstock
productive
doing or achieving a lot
Antonio was very productive at the library—he finished all his homework.
photo credit: aldomurillo/iStock/Getty
breed
mate two animals to produce babies
The zoo plans to breed its Bengal tigers because the species is in danger of dying off.
photo credit: Dmitriy Sylenko/Shutterstock