Anger is a strong feeling of displeasure. Another word for angry is mad. People often get angry when they don't get their way, or when someone disagrees with them. The person in the picture is angry.
A battery is a device that stores electricity. Things that have batteries still need power to run, but you don't have to plug them in to a power point in your house. When a battery runs out of power, you need to get a new battery or recharge your old one.
Scientific name: serinus canaria domestica
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Scientific name: apium graveolens