Question

The loss of limbs has occurred in amphibians, "lizards", and serpentes multiple times. Because of this it is not easy to identify the phylogenetic position of a limbless vertebrate. What would be a reliable way to separate an Amphisbaenian from a Caecilian? Determine whether the organism is fossorial Examine the skin to see if it has keratinized scales Examine the body to see if it is elongated Examine the skull for blunt features

Answer 1

Answer:-1:-

Caecilian have different type of skulls which separate them from amphibians.

From forces we cannot determine the organism as it is time consuming,elongated body is a common feature which can not determine the difference between amphibians and caecilians.

So,option 4 is correct that Examine the skull for blunt features.

Answer:-2:~

Pythons black venom and reply on construction tosuffocate their pray and than se allow them whole.Based on this i would placed python in Caenophidia because these aren't herbivores and aren't blind and further I can say that these aren't fossileria.And Python derive himself.

So option 3rd is correct that Caenophidia,including more derived snakes is the correct answer.

Answer:-3:~

Chameleon changes colour to help regulate temperature as they can not themselves regulate their temperature.

To intimidate conspecific rivals and for camoflauge to exactly match the colour of their environment for their security , chameleon changes colour.

So option 3rd is correct that To indicate mood and emotions.