What is the largest cause of prior and ongoing extinctions? (i.e., has caused and is causing the largest number of species to go extinct?)

How does spraying mosquitoes with insecticide eventually lead to insecticide resistance?

A plain is covered in a species of tall grass (primary producer). One primary consumer species eats the grass. One secondary consumer species eats the primary consumer. And one tertiary consumer species is at the top of the food chain. Which of these is the dominant species on this plain?

Although some families have higher risk of cancer, most cancers are NOT passed down from parent to offspring. Why not?

You find a four-legged animal on the shore of a pond. It has a backbone, and can breathe through its skin, but also has lungs. Its eggs are thin, lacking an amnion, and must be laid in the water. This organism is…

For any given ecosystem, which of the following trophic levels would take in the most TOTAL energy over the course of a year?

Which of the following best distinguishes algae from protozoa?

In a eukaryotic cell, inside which organelle does DNA get transcribed into RNA?

You put a membrane in a container of water, then put some solute on each side. You put more solute on the left than on the right. In this diagram, solute is shown as black dots:                                             This diagram shows the STARTING state of the container, before any movement has occurred. Which one of the following statements is TRUE?

A cell contains a molecule called Testase. Testase speeds up a reaction that breaks a different molecule, called Targetose, into two smaller pieces. The process releases energy. Targetose -> Piece A + Piece B Which statement is TRUE?