<Li> Semelparous organisms reproduce only once in their lifetime, such as annual plants (including all grain crops), and certain species of salmon, spider, bamboo and century plant . Often, they die shortly after reproduction . This is often associated with r - strategists . </Li> <Li> Iteroparous organisms produce offspring in successive (e.g. annual or seasonal) cycles, such as perennial plants . Iteroparous animals survive over multiple seasons (or periodic condition changes). This is more associated with K - strategists . </Li> <P> Organisms that reproduce through asexual reproduction tend to grow in number exponentially . However, because they rely on mutation for variations in their DNA, all members of the species have similar vulnerabilities . Organisms that reproduce sexually yield a smaller number of offspring, but the large amount of variation in their genes makes them less susceptible to disease . </P> <P> Many organisms can reproduce sexually as well as asexually . Aphids, slime molds, sea anemones, some species of starfish (by fragmentation), and many plants are examples . When environmental factors are favorable, asexual reproduction is employed to exploit suitable conditions for survival such as an abundant food supply, adequate shelter, favorable climate, disease, optimum pH or a proper mix of other lifestyle requirements . Populations of these organisms increase exponentially via asexual reproductive strategies to take full advantage of the rich supply resources . </P>

Advantages of being able to reproduce asexually and sexually
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