A pathogen that has nutrients absorbed from its environment is called fungus. Fungus is a eukaryotic microorganism that is a heterotroph and acquire its food by absorbing dissolved molecules, typically by secreting digestive enzymes into their environment
The answer is b)
The niche is the job the animal does in it's habitat to contribute to the habitat.
The correct answer would be D.
After many generations, only those with genes suitable to live in harsh environments can live. These genes are passed onto their offspring and then we see a rise in antibiotic resistant strains of bacteria such as Methicillin Resistant Staphylococcus Aureus (MRSA).