All natural resources are non-renewable resources, such as metals and timber. False
True

Natural resources are usually either renewable or non-renewable.

Explanation:

Timber is a renewable resource because of the regrowth of forests.

Although the elements and resources that go into producing metal products are nonrenewable, metal can be recycled, making it a hybrid between renewable and nonrenewable classification

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.