A bear feeds upon fish in the river. Which interaction between the bear and fish is represented below? SC.7.L.17.2

In which type of ecosystem would fire most likely be a limiting factor for plant species? SC.7.L.17.3

Which example listed below classifies organisms representing commensalism? SC.7.L.17.2

Which of these examples does NOT depend on the population size of organisms living in an area? (SC.7.L.17.3)

Manatees are an endangered mammal species that lives in bodies of water in Florida. Manatees eat plants that grow in the water. They know where to find fresh drinking water in their environment. Manatees migrate from summer habitats to winter habitats and look for safe areas to feed and raise their young. People in boats need to give space to manatees to protect them from harm. What might conservationists do to reduce the limiting factors and increase manatee populations? (SC.7.L.17.3)

Squirrels eat acorns. Good acorn production happens when there are good growing conditions for the oak trees that make acorns. Often, there are many acorns produced one year but very few acorns the next year. What is the most likely impact on the squirrel population in years when fewer acorns are produced? (SC.7.L.17.3)

Mosquitoes are parasites that feed on the blood of other organisms. People are often bitten by mosquitoes. Mosquito bites can be painful, red, and itchy and can also transmit diseases such as malaria. Which of these comparisons is most similar to the parasitic relationship between a mosquito and the person it bites? (SC.7.L.17.2)

A flowering plant, called mistletoe, attaches itself to the vascular system of a tree and removes nutrients and water from the tree. The tree can become weak due to the presence of this plant. Mistletoe can produce some food of its own through photosynthesis and serves as food for some birds and other animals. What word best describes the relationship between mistletoe and the tree it inhabits? (SC.7.L.17.2)

The clownfish and sea anemone interact in a marine ecosystem in which both organisms benefit. Which of the interactions listed best identifies the clownfish and sea anemone relationship? (SC.7.L.17.2)

Which statement is an example of predation? (SC.7.L.17.2)

Bees feed on nectar in flowers. To reach the nectar, a bee must fly deep inside the flower. Inside the flower are pollen grains that are produced by the flower's male reproductive organs. The pollen sticks to the furry parts of the bee's body, and the bee transports the pollen as it visits other flowers, allowing the other flowers to be fertilized. Which of these relationships best describes the interaction between the bee and the flower? (SC.7.L.17.2)

Lions are a large, cat species that live in the savannahs of Africa. As carnivores, they hunt and feed upon herds of zebra. The zebra are also hunted by groups of cheetah, which are another species of cat. Groups of lions and cheetah will often hunt and drive off each other when zebra populations get too low. The relationship between lions and cheetahs is best defined as which of the following? (SC.7.L.17.2)

The leafcutter ant is a species of tropical ant that will cut pieces of leaves from trees and carry them back to their nest. The ants will chew up these leaves into a pulp and use the pulp to grow a type of fungus. Like a farmer, the ants harvest the fungus as a crop to feed the colony while the fungus grows and feeds on the pulp provided by the ants. Which type of interaction best describes the fungus and the ants? (SC.7.L.17.2)

The humpback whale is a large marine mammal that lives wide spread throughout the North Pacific Ocean. Barnacles are small marine crustaceans that will attach themselves to the bodies of humpback whales. Though the barnacles grow on the skin of whales to filter feed, they are too small to harm the whale. This example best defines which of the following? (SC.7.L.17.2)

Barnacles create home sites by attaching themselves to whales. This relationship neither harms nor benefits the whales.

Yucca flowers are pollinated by yucca moths. The moths lay their eggs in the flowers where the larvae hatch and eat some of the developing seeds. Both species benefit.

Mistletoe extracts water and nutrients from a spruce tree. The spruce tree is harmed. 

The stork uses it saw-like bill to cut up the dead animals it eats. As a result, the dead animal carcass is accessible to some bees for food and egg laying. The relationship neither harms nor benefits the stork.

In a mutual relationship, both organisms are ________________. 

In a parasitic relationship, one organism is ___________ and one organism is benefiting. 

A relationship that occurs when two or more organisms of the same species need the same resource at the same time...

Example of a biotic factor...

Example of abiotic factors...

All living things or organisms in an ecosystem are