Question 18 of 20: select the best answer for the question. 18. which of the following is true of red blood cells? o a. once created in bone marrow, they circulate for our lifetime o b. they live for only 120 days o c. they have multiple nuclei o d. they live for only about 20 days

What advantage does a crop that undergoes vegetative reproduction have over plants that start from the seed? 1points a they store nutrients. b they can travel farther. c they experience more genetic variation. d they only occur in high-resource environments.

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks

Aparent with freckles is crossed with a parent without freckles. the punnett square shows the possible genotypes and phenotypes of the offspring. which statement accurately describes the probability of phenotypes? a.the offspring are more likely to have freckles. b.the offspring are more likely to have no freckles. c.the likelihood of the offspring having freckles and not having freckles is the same. d.the likelihood of the offspring having freckles and not having freckles cannot be determined.