Question

below is a food web from an ocean ecosystem in monterey bay, off the coast of california. which two of the following organisms are omnivores in this food web? sea urchin plainfin midshipman phytoplankton kelp bass orca

Explanation:

1. Sea Urchin: Eats kelp (producer) and possibly other organisms, showing omnivorous behavior.
2. Plainfin Midshipman: Consumes phytoplankton (producer) and zooplankton (consumer), indicating it eats both plants and animals.
3. Phytoplankton: Producer (photosynthetic), not an omnivore.
4. Kelp Bass: Eats both kelp (producer) and other consumers (e.g., zooplankton, bat star), so it is an omnivore. Wait, correction: Re - evaluating the food web, kelp bass has arrows from kelp (producer) and other consumers, so it is omnivorous. But initially, let's re - check each:

• Orca: Top predator, likely carnivore.
• Phytoplankton: Producer (autotroph), not omnivore.
• Sea Urchin: Eats kelp (plant) and maybe detritus or other, but in the web, if it has a connection to kelp (producer) and maybe other? Wait, the correct omnivores here are likely plainfin midshipman (eats phytoplankton - producer and zooplankton - consumer) and kelp bass (eats kelp - producer and other consumers like bat star, zooplankton). Wait, let's re - analyze the food web arrows:
• Plainfin midshipman: Arrows from phytoplankton (producer) and zooplankton (consumer) → eats both.
• Kelp bass: Arrows from kelp (producer) and bat star/zooplankton (consumers) → eats both.
• Sea urchin: Eats kelp (producer) and maybe detritus, but if the web shows it only eating kelp, it's herbivore. Wait, maybe the intended answers are plainfin midshipman and kelp bass? Or plainfin midshipman and sea urchin? Wait, let's check standard food web knowledge:
• Plainfin midshipman: Omnivore (eats plants and animals).
• Kelp bass: Omnivore (eats kelp and other organisms).
• Sea urchin: Often herbivore (eats kelp), but some species are omnivorous. However, in the given options, the two omnivores are likely plainfin midshipman and kelp bass (or plainfin midshipman and sea urchin, but re - checking the arrows:
• Plainfin midshipman: Arrows from phytoplankton (producer) and zooplankton (consumer) → omnivore.
• Kelp bass: Arrows from kelp (producer) and bat star/zooplankton (consumers) → omnivore.
• Sea urchin: Arrow from kelp (producer) → herbivore? Maybe the diagram has more, but based on the options, the two omnivores are plainfin midshipman and kelp bass (or plainfin midshipman and sea urchin, but let's confirm:
• Omnivore: Organism that eats both producers (plants/algae) and consumers (animals).
• Plainfin midshipman: Eats phytoplankton (producer) and zooplankton (consumer) → omnivore.
• Kelp bass: Eats kelp (producer) and other consumers → omnivore.
• So the two are plainfin midshipman and kelp bass (or plainfin midshipman and sea urchin, but likely plainfin midshipman and kelp bass). Wait, maybe the correct answer is plainfin midshipman and kelp bass.

Answer:

The two omnivores are:

• plainfin midshipman
• kelp bass

(Note: If re - evaluating sea urchin, if it eats both plants and animals, but in the diagram, if sea urchin only has an arrow from kelp, it's herbivore. So the correct pair is likely plainfin midshipman and kelp bass.)