Mites and ticks are relatives of the spider. They are members of the class Arachnida. They are small arachnids that are mostly parasitic.

C. arachnids

Spiders have spinneret glands which are responsible for producing spider silk.

B. spinnerets

Echinoderms exhibit a spiny skin, an internal skeleton, tube feet, a water vascular system, and a five-part radial symmetry.

B. a pair of antennae

Members of the class Arachnida have four pairs of legs that are used for walking.

C. Arachnids

Pheromones play an essential role in an insect’s survival by triggering a particular behavior or function in an individual. They serve as messengers that give out signals about any food source, potential harm or a call out for a mate.

D. pheromones

Spiders and their relatives such as scorpions, mites, and ticks are members of the class Arachnida.

C. Arachnids

Trilobites are the extinct relatives of marine arthropods. These animals appeared 500 millions of years ago and they dominated the ocean during the Cambrian period.

A. Trilobites

According to the table, a cricket chirps 12 times in 15 seconds when placed in a temperature of 11 degrees Celsius. Given this condition, if a cricket is placed in a temperature of 10 degrees Celsius, it will chirp for 9 times in 15 seconds.

B. 10 degrees Celsius

According to the table, the number of chirps and the temperature shows a positive relationship. This means that when the temperature decreases, the number of chirps also decrease.

B. The number of chirps decreases when the temperature decreases.