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Based on the three methods of defining species, scientists now know the exact number of species on the planet.

Which of the following is not a characteristic of a prokaryote?

Which group of plants have naked-seeds and consists of ginkgos, cycads, and conifers?

Which of the following is included in the archaeplatida supergroup?

Molluscs were the first organisms to have a(an)  ______ body plan and well-developed organ systems.

Fungi are saprobes. This means they

Which of the following shared characteristics among arthropods introduced an increase in locomotion in the evolutionary timeline?

Prokaryotic cells can be defined by their metabolic abilities. A chemoheterotroph is an organism that uses ______ for energy.

Which of the following examples belong in the bivalves group of molluscs?

Biodiversity hotspots only cover 2.4% of the world’s surface. If we were to lose these areas, we would also lose approximately ______of all plants, and ______ of all animal species.