What are atoms of the same element that differ in their numbers of neutrons called?

• Correct Answer: opposites
• reactions
• organisms
• isotopes

Explanation: The first plants were probably similar to the stoneworts in Figure below . Stoneworts are green algae. Like stoneworts, the first plants were aquatic. They may have had stalks but not stems. They also may have had hair-like structures called rhizoids but not roots. The first plants probably had male and female reproductive organs and needed water to reproduce. In stoneworts, sperm need at least a thin film of moisture to swim to eggs.

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