Food Web, Succession and Metal Review

What impact does the introduction of a non-native species that eats shellfish have on marine ecosystems?

• The plant's lack of natural predators will lead to uncontrolled growth, competing with native species and disrupting the energy flow in the food web.

• The introduction of the plant will increase the clam population, which in turn will raise algae levels, altering the energy dynamics within the ecosystem.

• In the absence of natural prey, the plant will compete with other species, causing an increase in the shellfish population and further competition with native organisms.

• The plant's freedom from predators will allow it to grow unchecked, competing with native species and enhancing energy transfer within the food web.

Imagine a barren island where a volcanic eruption recently occurred. What do you need to know to determine if this is a primary succession?

• Why is there no soil, grass, or shrubs present on the island?

• Why are there so many kinds of animals living on the island?

• What types of hardwood trees are growing on the island?

• What caused the volcanic eruption that affected the island?

Aria and Zoe are ecologists studying the relationships between biodiversity, populations, and the stability of a lake ecosystem. Their goal is to increase the sustainability and health of organisms in the lake ecosystem. Which goal will help Aria and Zoe improve the sustainability and health of organisms in the lake ecosystem?

• Ecologists propose to increase the amount of water in the lake.

• Ecologists propose to decrease the number of native species in the lake.

• Ecologists propose to increase the number of invasive species in the lake.

• Ecologists propose to increase the diversity of native species in the lake.

Scarlett is working on a science project about the element chlorine(Cl). She examines the location of chlorine in the periodic table to understand its physical properties. Which describes chlorine based on its location in the periodic table? Select all correct answers.

• chlorine is a poor conductor of electricity.

• chlorine is a good conductor of electricity.

• chlorine has a bright luster.

• chlorine does not have luster.

• chlorine is a metal.

The chemical formula for ethane is C₂H₆. Which statement describes the atoms present in three molecules of ethane?

• Three molecules of ethane would contain 2 atoms of carbon and 6 atoms of hydrogen.

• Three molecules of ethane would contain 6 atoms of carbon and 18 atoms of hydrogen.

• Three molecules of ethane would contain 3 atoms of carbon and 6 atoms of hydrogen.

• Three molecules of ethane would contain 18 atoms of carbon and 18 atoms of hydrogen.

Consider the chemical reaction: 2H₂ + O₂ → 2H₂O. Which statement best demonstrates the conservation of mass in this reaction?

• A. Water is produced as a result of the reaction.

• B. The number of oxygen atoms in the reactants is equal to the number of oxygen atoms in the products.

• C. Hydrogen and oxygen are both present in the reactants.

• D. The reaction produces a compound that was not present in the reactants.

Which of the following is a sign that a chemical reaction has taken place?

• Water vapor condenses on a cold surface.

• Ice melts into liquid water.

• A gas is produced when two liquids are combined.

• Salt dissolves in water.

Identify which of the following scenarios involve a chemical change. Choose TWO correct answers.

• Boiling water

• Rust forming on iron

• Ice cream melting

• Burning wood

• dry ice is sublimating (evaporating)

Invasive species can have a major impact on the ecosystem.

• TRUE

• FALSE

Invasive species can disrupt ecosystems by _____ rapidly. This results in _____ resources for native species.

• multiplying, fewer

• multiplying, more

• diminishing, fewer

• diminishing, more