The dura mater and the pleura are similar in their function in that

The dura mater and pleural contain fluid which lubricates the brain and lungs respectively.

Explanation:

Dura mater is the outermost layer and a sac in the brain that envelope arachinoid and it's surrond venous channels which carried blood from the brain to the heart. The dura mater contain cerebrospinal fluid and drains it from the brain to the internal jugular vein

The pleural help in the proper functioning of the lungs and it supply pleural fluid which lubricates the lungs and allow for respiration.

1. desertification

2. captive breeding

3. black rhinoceros

4. renewable resources

explanation:

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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.