No, not every scientific method begin with an observation. on basis of what we want, steps for scientific method changes.
And in scientific method before observation, first we predict (what will happen in the experiment). after prediction we observe. Prediction is known as hypothesis. And observation is what we are viewing.
<span>Evidence that supports this includes the lack of true tissue in sponges and the close similarity between choanocytes and choanoflagellates.</span>
The introduction of a carbon-carbon double bond would cause a overall structure of the molecule to bend.
Carbon-carbon bonds are the type of bonds seen in hydrocarbon compounds which consists of two carbon atoms that has covalent bonds between them.
Covalent bonding occurs between atoms that share the electrons in their outermost shell to achieve an octet shape like the noble gases.
When there is an introduction of a carbon-carbon double bond, it leads to the bending of the overall linear structure.
This bend that is caused by the double bond is often referred to as "cis" and leads to a change in some physical properties of the molecule such as :
Therefore, the introduction of a carbon-carbon double bond would cause a overall structure of the molecule to bend.
Learn more about carbon here:
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Theories are an idea that science have and they aren’t always right so false
