The biological levels of organization of living things arranged from the simplest to most complex are: organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere.
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Answer:
The answer should be the third option. 'All animals are multicellular heterotrophs'
Explanation:
Answer: Option D) neurotransmitters
Explanation:
Neurotransmitters are secreted from the terminal of a neuron and bound by a specific receptor protein in the next neuron. They exists within the neurons of the brain, and NEVER come in contact with blood.
Examples include acetylcholine, glutamate, glycine etc.
Answer:
Carbohydrate and Nucleic Acid
Explanation: