Adisadvantage of asexual reproduction is that offspring lack ; therefore, all the offspring are vulnerable to attack by the same diseases or pests.
a. cotyledons
b. genetic variation
c. radicles
d. cuticles

B. Genetic variation

Explanation:

New combinations of genes and alleles impart genetic variations to the offspring produced by sexual reproduction. These new gene combinations are produced during meiosis and fusion of male and female gametes. Some of these genetic variations become beneficial under certain conditions and increase the chances of survival of the species under unfavorable conditions.  

Asexual reproduction includes a single parent. It does not involve the fusion of male and female gametes. Therefore, the progeny produced by asexual reproduction is genetically identical to the single parent and lack any genetic variations. The absence of genetic variations makes this progeny prone to be adversely affected by any biotic or abiotic disturbances such as diseases.  

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i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.