Moving and supporting your body weight on land is challenging. which feature arthropods move efficiently in land?
a. exoskeleton made of chitin
b. open circulatory system
c. nervous system with both dorsal and ventral ganglia
d. excretory system of highly efficient malpighian tubules

a. Exoskeleton made of chitin

Explanation:

Arthropods are invertebrate animals with articulated locomotor organs, which is the main characteristic of this phylum. The articulated paws allow the animal to perform various movements, very well defined and elaborate. This feature gives these animals not only efficient locomotion, but also aids in their defense and food capture.

They have another striking feature as well, which is the diversely segmented body, but always covered by a chitin cuticle, which represents its exoskeleton. Some have a calcareous shell outside the chitinous exoskeleton, such as crustaceans.

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.