The vascular bundles are arranged in a range that separates them into two regions this type of vascular arrangement would be seen in?

In higher plants

Explanation:

Vascular bundles are the type of bundle which are responsible for the transportation of water and food from one part to another part inside the body of plants. There are two types of vascular bundles i. e. xylum and phloem. Xylum transport water from roots to shoots, while phloem carries food from leaves to storage organs. In higher plants such as shrub and tree, rings are present which separates xylum and phloem from one another.

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.