4. During replication, DNA molecules separate into single strands, which are then used to construct two identical strands of DNA, one old and one new. This process ensures that the

rising sea temps which are causing coral reefs to bleach and die out

glaciers are melting causing sea levels to rise wgich could flood out land

explanation:

because of

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.