The statement with exceptions is:
- Sexual reproduction involves parental care, while asexual reproduction does not.
While many sexually reproducing species do provide parental care, there are also many species that reproduce sexually without any parental investment. Additionally, there are a number of asexual organisms, such as certain species of insects and plants, that can exhibit forms of care or protection for their offspring, though it may not be parental care in the traditional sense.
The other statements are generally more accurate and do not have as many exceptions:
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Sexual reproduction typically requires two parents, while asexual reproduction typically requires only one parent.
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Sexual reproduction does usually produce genetic variation, while asexual reproduction typically does not.
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Sexual reproduction is generally more complex than asexual reproduction in terms of the mechanisms involved.