Primary succession can begin after
a. a forest fire.
b. a lava flow.
c. farm land...
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Biology, 21.06.2019 23:10
Depending on the organism the number of in a cell may change
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Biology, 22.06.2019 02:20
What is the function of the somatic nervous system? connects the brain and the spinal cord to the rest of the body carry signals to the muscles and glands includes all nerves controlling the muscular system and external sensory receptors controls internal organs like the heart and bladder
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Biology, 22.06.2019 09:30
Describe your dna model. which part do the straws represent? the pushpins? the paper clips and the black dots you made with the marker?
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Biology, 22.06.2019 09:30
Juan and carol were studying invertebrates in biology. they knew that segmented or earth worms preferred a dark, moist habitat. during this lab, they would be investigating the responses of organisms called planaria or dugesia tigrina. these were simple flatworms that still had a one-way digestive system and a very simple nervous system. juan and carol placed the planaria in a petri dish containing cool, distilled water that was partially covered with black paper. they shined a light on the dish. next, they removed the paper and placed a small amount of chicken liver at one end of the dish. they added a few large salt crystals to the water. finally, they added drops of hot water to the cool water in the petri dish. their results can be seen in the data table. according to their experiment, all but one conclusion is valid.
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