Answer:
Organ systems: human body and circulatory system
organs: heart
tissue: muscle
Explanation:
The fertilized part of a flower is called an ovary
Answer:
a scientific theory of the origin of species of plants and animals
Answer:
A hill is a part of land that rises higher then everything surrounding it its like a little bump in the earth. Mountains have less steep and not as high but a hill will usually have and obvious summit which is its highest point
