What are 3 instruments used throughout history to observe the motion of the planets and starts

If the grass contains 100,000 kcal of energy, how much energy will a fox obtain from eating a bird?

Why is it important for scientists to repeat an experiment several times before they are confident of their results?

Select the benefits of reproduction by meiosis. Organisms can reproduce rapidly. Genetic variation occurs. Mutations are not copied over and over again. Genetically identical copies of parents can be made.

Since we can't drink ocean water due to its salt content, why is polluting the oceans so much a concern for people?

A organism must purposefully model a behavior in order for others to learn from it. true or false?

A chemical is sprayed on a plant which causes the plant to lose its leaves. The plant will die because A. it would lose too much water. B. it would not be able to produce fruit and seeds. C. insects would not be attracted to the plant. D.

Which statement correctly describes terrestrial planets?

4. Why must transcription occur in the nucleus?

In this diagram of the water cycle, water returns to the atmosphere by the process of

An example of a human-caused disturbance is Question 5 options: a hurricane. Forest-clearing. Flooding. Growing lichens.