Describe the external features of a toad ​

The body of a toad is divisible into head, trunk and limbs.

Explanation:

Head and trunk are not separated by a flexible neck; this condition is very suitable for aquatic (aqua = water) life. The adult has no tail. ... Each side of the body is said to be lateral and structures on the middle line of the body are medial.

Like frogs, toads are amphibians. They differ from most frogs because they have dry skin, warts, crests behind the eyes, and parotoid glands.

The parotoid glands produce a poisonous secretion that helps the toad defend itself from predators.

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.