Explanation:
Modern methods indicate that the mutation rate is roughly one to two mutation per 10,000 genes per generation.
<span>As the pollen tube penetrates the ovule, it releases two sperm cells. As in gymnosperms, the ovule becomes a seed, encasing the embryo and endosperm in a seed coat. But unlike gymnosperms, in angiosperms the ovary containing the ovules develops into a fruit after fertilization.</span>
Explanation:
it is systematic desensitization.
