Chapter 17: The Evolution of Plant and Fungal Diversity 14.
Figure 17.18B on page 364 of your textbook illustrates an elegant experiment that tests the
hypothesis that a plant's “sym” genes are necessary to form mycorrhizae with fungi. Clearly
indicate the following: what hypothesis they were testing, how they tested their hypothesis, and
identify their control and their results.

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do you have a picture?

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers