Which of the following is the most important process specific to land-dwelling plants? a. production of photosynthetic pigment b. conservation of water c. exchange of gas d. presence of cell wall

Some tools have graduations to show multiple measurements. for example, a ruler may have graduations for both millimeters and centimeters. when measuring the length of an earthworm, which graduations would allow for the most accurate measurement? millimeters centimeters decimeters meters

What type of appendages do sponges cnidarians roundworms annelids mollusks arthropods echinoderms and vertebrate have? jointed, not jointed, absent  

This is a situation in which genes are attached to an organism's sex chromosomes; the sex of an organism influences the expression of a gene.