I believe it’s carbon dioxide, because you use your respiratory system to breathe in oxygen, and oxygen goes through your circulatory system. And you breathe out CO2.
<span>Do u need the answer out of these four question?
primary consumers (
secondary
tertiary
,,
producers
decomposers)</span>
Organs or organ systems are directly below the hierarchical organization of life. For an organism to act or function properly organ systems are needed to exist. The following are examples of organ systems that are needed by an organism:
1. Nervous System
2. Digestive System
3. Reproductive System
4. Respiratory System
5. Muscular System
6. Skeletal System
7. Endocrine System
8. Immune System
9. Excretory System
10. Circulatory System
11. Integumentary System
It is a stimulus because parts of the ear respond to exact stimuli which would make this a stimulus. Our bodies make us able to hear normally but some people's bodies are not able to respond to the stimuli which unfortunately explains deaf people.
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Answer: Larger groups may find it easier to improve their collective skills at tasks such as making fishing nets. ... Through laboratory experiments, they showed that complex cultural traditions — from making fishing nets to tying knots — last longer and improve faster at the hands of larger, more sociable groups.
Explanation: plz mark me Brainliest
