Asea urchin is an organism that does not have a backbone and lives in coastal areas. It has developed long, slender spines that protrude from its shel. Wat is the primary purpose of the spines the spines provide camouflage

Producers (autotrophs) are in the bottom (first) trophic level, primary consumers are in the second trophic level, secondary consumers are in the third trophic level and tertiary consumers are in the top trophic level. energy moves through the trophic levels when one living organism is being consumed by another. moreover, energy level becomes lower as it moves up the energy pyramid because of it being released as heat. food chain is when there is a single pathway of energy transfer whereas a food web is when there are multiple pathways of energy transfer.

Which of the following is not associated with purines-regular heartbeat

Answerin a cactus is fixed only during the night;

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