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Questions in biology

[Homework Help] Elias conducted an experiment about the effects of exercise on the heart rate of teenagers. Before morning basketball practice, he asked the members of his high school team to be his subjects. He measured each of their heart rates before and after a set of exercises. Which change would most reduce the bias of his experimental design?

[Homework Help] Why does increasing soil salinity have adverse effects on plant cells?

[Homework Help] Describe how a physical property, such as mass or texture, can change without causing a change in the substance.

[Homework Help] What kind of relationship would a hummingbird and a daffodil have?

[Homework Help] Where is the largest telescope built?

[Homework Help] Are insects endothermic or ectothermic?

[Homework Help] Explain the difference between mitosis and meiosis.

[Homework Help] What will happen if bone marrow gets destroyed?

[Homework Help] What are 'pneumatophores'? How do they help the plant? Give an example.

[Homework Help] List the function of the nucleus. Name the cell part that has tiny holes.