Read this sentence from the passage. He invented a machine called the crescograph, which could detect tiny movements within plant tissue when exposed to things like light or harmful substances. How does this sentence contribute to the overall idea in paragraph 3?

A. It suggests that people are already aware that plants could detect changes.
B. It compares crescographs to other machines by showing the similarities between them.
C. It describes how crescographs work to explain the term "natural sciences."
D. It explains the function of a crescograph to familiarize the readers with the device.

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Identify the trade regulation concept described in each scenario. protectionism free trade trade war country a and country b want to develop their respective export markets. both countries have highly developed agricultural, industrial, and service sectors. the countries decide to initially lower trade barriers and eventually remove them completely. arrowright country a has an agrarian economy with an emerging industrial sector. to allow domestic industries to grow, country a applies quotas on all industrial products except those that are used as resources. arrowright country a passes an economic policy that will indirectly give its own companies an advantage over country b’s companies. country b alleges that the policy violates the countries’ trade agreement and imposes retaliatory tariffs. arrowright

Me plz why do tourists have to view stonehenge from a distance? a. the stones could fall and injure someone.b. visitors have caused too much damage.c. visitors get in the way of scientists.