muscle - The heart is a , blood - The heart pumps , blood vessels - The blood moves through tubes called, beat - Each squeeze of the heart is called a , heart rate - The speed of beating is, Living organisms - Biology is the study of, microscope - We need it to see microrganisms, nervous - spinal cord is an organ of this system, joints - You can find them in your skeletal system, videos - One of the secondary resources to get information, dependent - The variable i need to measure in an investigation, ecology - One of the branches of biology, habitat - The place where an animal can find shelter and food, aneamia - A disease that means deficiency of iron in blood, hormones - Chemicals in the body that helps puberty to happen, tissues - You can find them in your organs, viruses - One of the pathogens that can cause diseases, immunity - It helps tbe body to prevent and fight diseases, cell - The smallest building unit of your body, repeats - We should do more of them to get reliable results in investigations,

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