When we are born, we have about how many brain cells?

When babies are born, their brains contain about a hundred billion of neurons. However, a few of these brain cells are connected. At age three, there are one thousand trillion connections formed. The brain starts to cut off unused connections at the age of eleven. 

The correct answer will be- 100 billion brain cells or neurons

Explanation:

The development of brain starts after three weeks of conception in the womb and the brain cells called neurons starts developing in the brain.

The brain usually develops about 100 billion neurons at the time of birth with very few synapses about 2500 synapse per neuron. In the first few years, the number of neurons increases to trillions and the formation of synapses begins and reaches about 15000 synapses per neuron at the age of five.

Thus, 100 billion brain cells or neurons is the correct answer.

During Interphase the cells copies it’s DNA. In the pictures it shows a chromatid duplicating into a sister chromatids.