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1. First situation: "A major disadvantage is the amount of time and energy taken to produce offspring"
Sexual reproduction requires finding a mate, courtship, and the fusion of gametes, which takes more time and energy compared to asexual reproduction (which is faster and more energy - efficient as it involves only one parent). So this describes sexual reproduction.
In sexual reproduction, offspring are produced by the fusion of gametes from two parents. This leads to genetic variation, so each puppy in a litter has a unique genetic makeup (due to the combination of genes from both parents). Asexual reproduction produces genetically identical offspring. So dogs reproduce sexually.
Prokaryotes like bacteria mainly use asexual reproduction methods (such as binary fission). Asexual reproduction is fast as it does not involve the complex processes of sexual reproduction (like finding a mate, meiosis, etc.). So prokaryotes reproduce asexually to grow their population quickly.
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Sexual Reproduction