Thorium 234 has a half life of 24 days. If you started with a 100-g sample of thorium-234, how much would remain after 48 days?

If a person has a deficient intake of calcium in the diet, what will be the result? a. no change in levels of calcium in the blood because calcium will be pulled from the bones b. reduced absorption rate of calcium by the body c.

A long-term memory forms when a. neurons send out spikes of electrical activity one time. b. the same collection or "pattern" of neurons fire repeatedly, forming a neural network. c. one neuron fires repeatedly

Do you think all organisms rely on the Sun in part for energy? Explain your reasoning.

What did the early sailors say emerging flies look like

Let's begin by taking a step back and considering leukemia and lymphoma in general. We learned that an important way to classify cancers is to consider the cell of origin. Leukemias and lymphomas are cancers that arise from a.

Which structure is Chad drew a diagram to compare animal cells and bacterial cells. Which label belongs in the area marked X? found in some but not all plant cells?

Waves crash against the shores of an island, creating beaches and gullies. In this scenario, what is the primary landform and what is the secondary landform? A. primary landform: island, secondary landform: beach and gully B.

What is one substance that uses facilitated transport

Technology has allowed us to not only see detailed structure of organelles, but it has also allowed us to see molecular machines, carrying out highly sophisticated tasks. true false

Which ocean borders Africa on the western coast