Why human body is so limited?

We are always asking why we are what we are? Why some behavior that is automatic with other species is not automatic for humans? Why we cannot form couples like some other animals? Why our body is so limited? 

Or why we cannot close our salivary gland in dry conditions? Why we don't have veins where is botulinum? That kind of poison would protect us against predators like wolves?

Why our immune cells don't protect us against botulinum poison? If we have an immune system that can handle botulinum, we could eat poisoned flesh, what could be a suitable ability in the desert? Why did evolution decide that we don't need protection against the neurotoxins like botulinum? 

Why our skin is not green? Why we cannot make photosynthesis in our body? If we would have chlorophyll in our skin, that makes us independent from fresh vegetables if we could produce vitamin C  in our body? When we are thinking that our body is formed by evolution. Why we must use the same teeth for almost 100 years? Why tissue of teeth is no renewing? 

Why we have the ultimate intelligence to other species, but our teeth are changing at the age of ten? And then we must use the same teeth rest of our life, which might be even 100 years. When we are getting older. We must go to the dentist, and then patch up the holed teeth. 

Bur why teeth are like they are? Why they are not renewing, and why they cannot fix the holes? Dangerous bacteria can infect the human body through that hole, and this is the thing, why some people are wondering why we are like, what we are? Another question is, why humans who are so superior to other species don't have sonars like whales and bats?

Don't we need the ability to operate in caves and dark places? We have no infrared eyes, which are common with reptilians, and we must ask don't need the ability to see predators in the dark? The thing is that the only thing, what makes humans so superior to other animal is intelligence. The intelligence is allowing us to create systems, that we can use in the dark caves. 

The infrared lamps and portable sonar systems are the ultimate tools for operating in dark caves. The idea to use those systems is that they don't disturb animals. Those are living deep underground in total darkness. 

The acoustic weapons can save the lives of endangered cats and other predators. 

The acoustic systems can also transmit the image to HUD screens that are installed on the helmets. The ultra- and infrasound systems can also use as weapons, and if something attacks against those people, they can activate the defensive mode. The system can create sound, which just cripples the attacker. 

And of course, the military and law enforcement are interesting in that kind of weapon. But acoustic weapons can also save the lives of the dangered animals. The system can use against attacking predators like leopards, and the acoustic weapons don't injure its target permanently. So that thing makes it possible to save the lives of the dangered cats and other animals. 

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