normally two.
Insect sensors are called Antennae.
Insects only have one pair of antennae. Insect's antennae are their primary olfactory sensors. Crustaceans have an anterior pair of antennae. This second set of antennae are used to detect odors.
Antennae.
none a spider is an arachnid not an insect so it doesn't have antennae
An insect. No, a tick comes from the order of Arachnida. It has too many legs to be an insect - it has 8, four on each side of its body and no antennae.
Antennae.
You need much more information to identify an insect.
so it knows of it bumps in to anything.
Centipede
Rove beetles are one example of an insect that has hard feelers or antennae. The Rove beetle's antennae are encased in tough cuticle or exoskeletal armor.
No. The spider is not an insect, because it does not have six legs, three body parts and antennae.
I am an INSECT.