You can in the US if the color change is novel, nonobvious, and useful.
Yes, in pollination.
Patent
According to the US Patent and Trademark Office:A utility patent may be granted to anyone who invents or discovers any new and useful process, machine, article of manufacture, compositions of matter, or any new useful improvement thereof. A design patent may be granted to anyone who invents a new, original, and ornamental design for an article of manufacture.
You have to file a Utility patent application form with The United States Patent and Trademark Office. A utility patent applies to any invention or new useful improvement thereof.
They'll have to test their blood sugar.
The term patent usually refers to a right granted to anyone who invents or discovers any new and useful process, machine, article of manufacture, or composition of matter, or any new and useful improvement thereof. Filing a patent costs between $5000 to $15000
patent
Honey is useful for any diseased except death
It would be smart to get a provisional patent first. They are inexpensive and can be useful for two reasons. Reason number one, they are a patent an will protect your idea. Reason number two, it is much faster to acquire a provisional patent than it is to apply for a registered patent.
There are no cons about honey bees. They are useful by producing honey, wax, propolis and by pollinating plants.
fist an idea then say if it is useful then you patent it you can be any age and try to sell it to dealers