Can someone me with this? i'm not asking for all the answers, i just need an explanation and a few ideas.

First of all, what are the levels of the ocean?

I believe they're talking about the three levels of the ocean based on how much sunlight they receive. There are three levels:

Euphotic - receives the most amount of sunlight possible, enough for photosynthesis to occur.

Dysphotic - still receives a little amount of sunlight, but photosynthesis does not occur at this level.

Aphotic - the last level. It is pitch dark, which means no sunlight manages to reach this area.

Note: If you have trouble remembering these, look at the morphology of the words. The prefix "eu-" means "well" (sunlight penetrates). The prefix "dy-" means "bad" (sunlight penetrates but not as good). The prefix "a-" means "no" (no sunlight penetrates).

Producers, consumers and decomposers:

Like in any food-chain, we have the producers, which are plants and microscopic organisms that do photosynthesis; we have consumers, which feed on plants or on other consumers; and we also have decomposers, which feed on consumer/producer remaining.

Procedure:

Choose one of the ocean levels (I recommend choosing the euphotic level since you can work on microorganisms that do photosynthesis, which is easier since there are many exceptions in regarding the algae energy collection) and study the producers, consumers and decomposers that it contains.

Recommendations:

I recommend you doing a software presentation rather than a video because it can be easier and simpler. All you have to do is explain the different types of organisms (producer, consumer and decomposer) and get images of them. I also recommend you do your own food web - be careful. When making your food web, make sure you choose animals that live in the same sea/ocean, otherwise, it might look weird. Give simple explanations to the food chains and the relationship between organisms.

When talking about adaptation, be clear with your words. Let's say you start talking about a swordfish. Explain some key characteristics and explain how they suit its environment, predation, etc.

When talking about the ocean environment, just be clear and detailed. Everything should be fine that way.

Hope it helped,

BioTeacher101

The Respiratory system controls the intake of oxygen and the exhale of waste products such as carbon dioxide from our circulatory system. The lungs control the gas exchange between our respiratory system and our circulatory system. Once the nutrients are in the blood stream, the circulatory system, red blood cells and white blood cells and other cells floating through arteries, all controlled by the pumping of the heart. Once the nutrients inhaled by the respiratory system are brought to the cells by the circulatory system (from the pulmonary vein to the heart to the arteries) through the much smaller capillaries, they are used in cellular respiration. The oxygen is used to help the products of glycolysis enter the mitochondria to produce more ATP.

 The waste products are then put back into the circulatory system through the capillaries. The circulatory system then takes the nutrients through veins back to the heart where it is then put through the pulmonary artery to the lungs. Once in the lungs gas exchange occurs, expelling the waste products and reoxygenating the blood.

Source: https://sites.google.com/a/student.oprfhs.org/ap-biology-interdependence/interdependence/interdependence-of-the-circulatory-system

Hopefully this helps you with your confusion!