How did the duck-billed dinosaur tooth fossil lead scientists to believe that the plants existed in Antarctica.

Explain why the membrane potential of a resting neuron is typically around 260 to 280 mv

The tiny gaps between adjacent schwann cells are called A) neurillema. B) nodes of Ranvier. C) axolemma. D) terminals. E) vesicles.

Allele frequency refers to the fraction of individuals with a particular version of a given gene. What effect does genetic drift have on the allele frequency of a population? A.

Atp is being used to move the molecules out of the cell by

Artificial selection involves the use of robots and "test tube babies." True False

Recognize and use signal words, Assignment Signal words let you know what's coming next in a sentence. Signal words show relationships between ideas. Use the drop-down menus to identify the signal words in each sentences.

Which processes are caused by convection currents in the mantle? Check all that apply. 1. earthquakes 2. ridge push 3. tsunamis 4. slab pull 5. volcanic eruptions 6. subduction

Imagine that you are studying the food preferences of a lizard species across its range. you have hypothesized that because these populations are fairly separate from one another, the lizards have evolved different food preferences.

An animal cell (left) and a plant cell (right) are shown. Which organelle labeled x in the diagram is found in both plant and animal cells

Where is the name of the process by which coal is taken from earth after the layer of ground on top of it is removed? A) Underground mining B) Coal rig mining C) Strip mining D) Water-blast mining