They were the first group of animals to successfully make transition to land.
major adaptations: the ability to resist drying, improved excretory system, They conserve water by getting rid of N wastes as urea or uric acid rather than as ammonia (most aquatic animals). They extract oxygen from air, not water. They switched from chemical senses (taste) to vision. They have the ability to withstand extreme temperatures or they become inactive in extreme temps.
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1. The chitinous exoskeleton
2. Jointed appendages (legs)
Arthropods - Chelicerates
They were the first group of animals to successfully make transition to land.
major adaptations: the ability to resist drying, improved excretory system, They conserve water by getting rid of N wastes as urea or uric acid rather than as ammonia (most aquatic animals). They extract oxygen from air, not water. They switched from chemical senses (taste) to vision. They have the ability to withstand extreme temperatures or they become inactive in extreme temps.