Which of the following demonstrates energy being released as heat? a. a child shivering in the cold b. a surfer on a surfboard c. lions sleeping after a big meal d. a baby bird eating a worm

Two friends at different locations want to communicate with each other by sending low energy signals. which of the following methods can they use to communicate? a) produce x-rays using colliding electrons and send them to radios, which capture sound b) send messages using infrared radiation, which travel in the form of waves c) send radio waves through intervening media like radio and television d) produce sound waves using microwaves from heated objects

What is the standard unit of measure for acceleration?

The excretory system,need answers for all: )