A group of tissues working together is an organ.
ANSWER:
A. an organ
The external ear structure is called the Pinna.
The Pinna helps to channel sound waves into the ear.
Many animals have the ability to move their pinna towards the direction of sound.
I have attached an image of a dog's ear to show you the external structure called the Pinna.
I hope this helps! I'm happy to answer any other questions you might have :)
[Image sourced from: https://www.msdvetmanual.com/dog-owners/ear-disorders-of-dogs/ear-structure-and-function-in-dogs]
Answer: B
Explanation:
carbon monoxide is poison and can kill you
If we do we can find the weak points in cancer contaminated cells
Cardiac muscle is found in only the heart because the heart is also called cardiac and said to have cardiac muscle.the answer is b. hope this helps :)