The functions of certain cells or organs are regulated by hormones, which circulate in the circulation.
Some basic characteristics of a hormone are:
- They are substances generated chemically by certain endocrine gland cells.
- Circulation carries them to the desired cells, tissue, or organ.
- They act according to their kind.
- They are present in incredibly small numbers. Most of them are soluble in water.
- They have a light molecular structure.
- After acting, they are destroyed.
- They are heterogeneous substances in terms of composition.
- They can't be kept for a very long period; typically, they are synthesized and secured as needed.
- Typically, they create hormone receptor complexes in target cells to activate them.
Learn more about the characteristics of hormones here:
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All living organisms are connected between each other because they have shared ancestor. I suggest you to read some stuff about evolution to make it more clear to understand.
<span>1 is the correct answer. Bias should not be part of scientific inquiry because science should be about impartially seeking objective truths through testing a hypothesis and analysing the results. Bias leads you to find a particular result that fits a prejudgement.</span>
