Which statement about enzymes is correct? a an enzyme decreases the rate of a chemical reaction. b an enzyme is shaped to interact with specific molecules. c an enzyme increases the activation energy of a chemical reaction. d an enzyme is broken down during a reaction and has to be replaced.

Hummingbirds drink nectar from flowers, while robins eat plant seeds. what does this reduce?

Sea levels are rising due to climate change while increasing numbers of people are moving into coastal areas. to accommodate more people, there has been increased construction of beachfront resorts and condominiums. how is this impacting sea turtle numbers and biodiversity and why? a. the increased human population in coastal areas has meant that more food is available to the turtles (e.g., dropped food, waste from restaurants), which has led to an increase in the numbers and diversity of sea turtles. b. there has been very little change in the numbers and biodiversity of sea turtles because the planet is so vast that they can simply relocate to less crowded beaches. c. this has resulted in a decrease in numbers and diversity of sea turtles because it is restricting available nesting sites, and hence reproduction. d. this has resulted in an increase in numbers and diversity of sea turtles because people are around to protect them from natural predators.

What are the characteristics of subsystem