Answer:
hope this helps you out good luck
Https://quizlet.com/57661309/chapter-41-flash-cards/?i=1ducf4&x=1jqY
Sponges are the simplest bilateral animal and do lack a body cavity. A sponge has two layers of tissue.
Answer:
Active heating captures sunlight, either as heat or electricity, to augment heating systems, while passive heating captures heat from the sun as it comes into your home through windows, roofs and walls to heat objects in your home (hope that helped?)
Explanation: