A good advancement would be a portable radio. They have made life easier for people who are walking/hiking and are looking for something such as the weather for the night or the score for a sports game.
Answer:
yes it is enough 1 month for six subject but revise 1 subject for 3 hour in the morning and in the evening
Answer: Visible light spectrum.
Explanation: On the entire electromagnetic spectrum, the human eye can only detect and view the visible light spectrum which is what we, as humans, can separate into “rainbow-like colors.”
