If you start with 100 grams of radioactive carbon in 50 grams remain after 5730 years what is the half-life of the isotope

1. Over time, the mushrooms that grow in a certain forest have been overharvested by humans. As a result, the number of mushrooms in the area has decreased dramatically. Fewer forest trees will become infected with harmful Dutch elm disease.

Should scientists be allowed to test products intended for human use on animals

What is the role of decomposers in the nitrogen cycle?

Which of the following characteristics might be found in an octopus, but not in a sunflower? a. capable of complex and rapid movement b. possesses cells with rigid cell walls. c. contains choanocytes within their tissues. d.

Cells talk to each other, whether they are isolated or parts of a multicellular body. Using cells in an animal as your models, explain the general ways in which cell communicate.

Give an example of stabilizing selection using body size of lizards

When a cell divides into two identical cells, what are these cells called

Live cultures of bacillus thuringiensis (dipel) and b. subtilis (kodiak) are sold as pesticides. what bacterial structures make it possible to package and sell these bacteria? for what purpose is each product used?

1. Extracellular calcium enters the axon terminal, triggering the exocytosis of acetylcholine. 2. Acetylcholine is removed by acetylcholinesterase. 3. Acetylcholine binds to receptors and depolarizes the postsynaptic membrane. 4.

What is the function of the waxy, transparent top layer of leaves? A. It produces glucose. B. It releases oxygen. C. It absorbs light energy. D. It prevents water evaporation.