Whare does digestion of starch begins?​

at mouth

Explanation:

saliva digest it from salivary glands

Mouth

Explanation:

The saliva supplies moisture, carbohydrate-digesting enzyme and amylase.

the reason the two sea urchins don't compete with each other for food, resources, etc. is because the urchins have adapted to the environment but they have also adapted to each other. this is most likely because the genes of the sea urchins.

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.