Copy of Wednesday (04/01) - Unit 8 Test Review 2026 (5/2/2026)

Hippos interact with oxpeckers, ticks, and crocodiles. Ticks suck the blood from the Hippos. Oxpeckers live on the backs of Hippos and feed on the Ticks found on the Hippos skin. Crocodiles are carnivores that prey on hippos living in the same environment. 

Which list describes the type of relationship the Hippo has with the other organisms.

Ecological relationships occur between organisms that interact in an ecosystem. Two examples of ecological relationships are described below.

• Example 1: Fleas are small insects that live on the bodies of mammals such as dogs. The fleas feed on the dog’s blood, gaining nourishment. As the fleas continue feeding, the dog may develop irritated skin, lose blood, and become more vulnerable to disease.

• Example 2: Red fox are are known to hunt rabbits in a grassland habitat. After locating the rabbit, the fox captures, kills, and eats it. This provides the fox with energy and nutrients needed for survival.

What is the main difference between the ecological relationships described in the two examples? Include the scientific term used to define each of the relationships.

Think about the question carefully. Then enter your answer in the box provided.

A food web is shown below.

Identify and explain the effect that the removal of Limpets would have on starfish and mussels.

Review the food web carefully. Then enter your answer and your explanation in the box provided.

A park manager is trying to reduce the population of algae in a pond. After researching control methods, the manager learns that a certain species of fish feeds on algae. The manager introduces several of these fish into the pond.

How might the manager’s action MOST likely have a negative impact on the ecosystem?

What ensures that carbon continues to flow throughout the carbon cycle?

Researchers studying green anoles in Houston's Memorial Park made a list of green anole facts.

1. Green anoles and brown anoles eat insects and spiders in the park

2. Mites live on green anoles but the anoles are unaffected

3. Green anoles eat blood sucking ticks off of brown squirrels

4. Coyotes and foxes eat green anoles

Which facts describe two species that have a competition relationship?

The diagrams show a partial food web containing the Tachinid flies and the life cycle of the Tachinid flies.

Based on the two diagrams, which list correctly identifies the relationship that the tachinid flies have with the other two organisms?

Populations of organisms making up an Artic Food Chain are represented below

Which statement describes a long term effect of a decrease in arctic cod?

Scientists conducted a field study for the ecosystem of Yellowstone park, their findings were summarized below

Removal of which organism will cause most instability in the ecosystem?

A partial food web is shown below

The populations of which organisms will most likely increase as a result of a disease that suddenly reduced the population of Lynx?

Determine if the processes below describe Photosynthesis OR Cellular Respiration:

In many coastal areas, algal blooms may occur as a result of the excess use of nitrogen-based fertilizers. When the algae die, decomposition uses large amounts of oxygen and releases a high concentration of carbon dioxide. This creates a "dead zone" where oxygen levels in the water are dangerously low. This reduces the activity of nitrogen-cycling bacteria and kills many native species.

Which statement describes how environmental changes are MOST LIKELY affecting the nitrogen cycle?

A forest ecosystem contains oak trees, caterpillars, songbirds, and foxes. A pesticide kills off most of the caterpillar population. Afterward, bird populations decline, and plant damage increases due to fewer natural controls on other insects.

Which statement BEST explains how extinction has affected this ecosystem?

After a wildfire, ecologists plant a variety of native grasses and wildflowers in a prairie ecosystem. Over time, insect, bird, and small mammal populations increase as more food and shelter become available.

This environmental change can affect the stability of the prairie ecosystem by causing the ecosystem to become —

In a forest ecosystem, deer are heavily hunted over several years, causing their population to decline. As deer numbers decrease, plant growth increases, and populations of insects and small rodents rise. Predators such as wolves begin to decline due to reduced food availability.

Which of the following is the MOST likely result of this environmental change?

During a harmful algal bloom in a coastal ecosystem, large amounts of algae grow rapidly and block sunlight from reaching underwater plants. As a result, many seagrasses die, and oxygen levels in the water decrease.

Which description BEST explains how this would affect the ecosystem in that area?

Which answer choice correctly identifies a relationship between two of these organisms?

Which evidence supports the answer to Part A?