D) Nitrogen-fixing bacteria in root nodules of legumes.
The effect of social facilitation on those performing a difficult task is that their performance tends to suffer
<h3>What is a
social facilitation?</h3>
This means tendency of presence of others which improve a person's performance on a task.
However, the effect of social facilitation on those performing a difficult task is that their performance tends to suffer
Therefore, the Option A is correct.
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Answer:
a. The Decimal System
Explanation:
The Decimal System, is one of the great mathematical innovation form ancient India. There is no clear date and place about the invention the decimal system.
It was first recorded in India, then spread to Islamic world, and further to Europe. Decimal system gave a unique turn to the world of mathematics and made the counting or measurement easy.
Hence, the correct answer is "a. The Decimal System".