Question 7 of 10

What could a human living now and a horse living thousands of years ago have in common?

◯ A. They need the same amount of energy to survive.

◯ B. They are made of some of the same matter.

◯ C. They have the exact same DNA.

◯ D. They both get their energy directly from the sun.

Life on Earth uses energy either directly or indirectly from thesun. However there are deep sea organisms that live off the energythat pour off from hydrothermal vents and don't receive any energyfrom the sun. Is it possible for a planet to have enough geothermalactivity to sustain a robust ecosystem without receiving any energyfrom a star?

11. As energy flows through the food web in an ecosystem, the amount of energy that is transferred from one trophic level to the next trophic level increases. stays the same. decreases. may increase or decrease, depending upon the system.

12. Autotrophs are organisms that obtain energy by breaking down tissues of organisms that have died. harness external energy sources to produce complex chemical compounds. depend directly on primary producers for their energy and nutrients. eat other autotrophs to obtain energy.

13. Which of the following gives the correct order for energy flow through an ecosystem? primary producers → secondary producers → tertiary producers primary consumers → primary producers → secondary producers secondary consumers → primary consumers → primary producers primary producers → primary consumers → secondary consumers

14. Which one of the following aspects of plant biology is not directly involved in maintaining an adequate supply of water for the entire plant? phloem roots xylem transpiration pull

15. Which structure(s) do most plants use to acquire the energy that they need for cellular processes? the roots the leaves the stem

Which of the following would not be found near the 3' end of a mature eukaryotic mRNA?