Microorganisms can mutate and evolve very quickly compared to most multicellular organisms. this allows pathogenic microorganisms to infect new species. suppose a very harmful microorganism that is quite successful at infecting hardwood trees is introduced into a forest ecosystem. what effect would this pathogenic microorganism most likely have?

It would disrupt the ecosystem by greatly reducing the population of a few species.

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.

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.