Endocrine signaling is hormone based signaling that travels through the blood stream. Many of the sensors and integrating sensors of the endocrine system are located in the brain. The brain barrier contributes to endocrine signalling, such that the brain barrier does not factor in with endocrine signalling. The answer is A
Xylem and phloem help transport nutrition
<span>Diploid number 4 implies 2n = 4. At the end of the meiosis prophase, chromatin condenses into two rod shaped structures called chromosomes, in which they become visible. The nucleolus disappears, the mitotic spindle forms, and the nuclear envelope disappears. The chromosomes are replicated forming two sister chromatids. In the end there are 8 chromatids.</span>
