1.Identify one independent variable (IV) from the selected research question. In one sentence indicate the IV. The IV is .

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An independent variable is one that does not depend on another element of the research to happen and that influences a result, acting on another variable.

For example, if a research seeks to understand the influence of sugar on childhood diabetes, sugar is the independent variable, as it is it that acts on the existence of diabetes.

Explanation:

A carnivore is an organism that mostly eats meat, or the flesh of animals. Sometimes carnivores are called predators. Organisms that carnivores hunt are called prey.

Carnivores are a major part of the food web, a description of which organisms eat which other organisms in the wild. Organisms in the food web are grouped into trophic, or nutritional, levels. There are three trophic levels. Autotrophs, organisms that produce their own food, are the first trophic level. These include plants and algae. Herbivores, organisms that eat plants and other autotrophs, are the second trophic level. Carnivores are the third trophic level. Omnivores, creatures that consume a wide variety of organisms from plants to animals to fungi, are also the third trophic level.

Autotrophs are called producers, because they produce their own food. Herbivores, carnivores, and omnivores are consumers. Herbivores are primary consumers. Carnivores and omnivores are secondary consumers.

Many carnivores eat herbivores. Some eat omnivores, and some eat other carnivores. Carnivores that consume other carnivores are called tertiary consumers. Killer whales, or orcas, are a classic example of tertiary consumers. Killer whales hunt seals and sea lions. Seals and sea lions are carnivores that consume fish, squid, and octopuses.

Some carnivores, called obligate carnivores, depend only on meat for survival. Their bodies cannot digest plants properly. Plants do not provide enough nutrients for obligate carnivores. All cats, from small house cats to huge tigers, are obligate carnivores.

Most carnivores are not obligate carnivores. A hypercarnivore is an organism that depends on animals for at least 70 percent of its diet. Plants, fungi, and other nutrients make up the rest of their food. All obligate carnivores, including cats, are hypercarnivores. Sea stars, which prey mostly on clams and oysters, are also hypercarnivores.

Mesocarnivores depend on animal meat for at least 50 percent of their diet. Foxes are mesocarnivores. They also eat fruits, vegetables, and fungi.

Hypocarnivores depend on animal meat for less than 30 percent of their diet. Most species of bears are hypocarnivores. They eat meat, fish, berries, nuts, and even the roots and bulbs of plants. Hypocarnivores such as bears are also considered omnivores.

The planet’s largest animal is a carnivore. The blue whale can reach 30 meters (100 feet) long and weigh as much as 180 metric tons (200 tons). It feeds by taking huge gulps of water and then filtering out tiny shrimp-like creatures called krill. The blue whale can eat about 3.6 metric tons (4 tons) of krill every day—that’s about 40 million of the little creatures. The largest land carnivore is the polar bear, which feeds mainly on seals.