PLEASE PLEASE PLEASE HELP ME The Sikhote-Alin Mountains and the Siberian tigers that live on them are separated from other tiger populations. The mountains are a barrier which are an example of a... *
-mass extirpation.
-invasive species.
-mass extinction.
-habitat fragmentation.

The observations of hooke and van leeuwenhoek documenting the existence of microscopic cells formed the basis of what important theory? a. the cell theory stating that all living things are composed of cellsb. the theory of spontaneous generation, which held that life forms could arise spontaneouslyc. the theory of chemotherapy, or use of antimicrobials to destroy pathogenic organismsd. the germ theory of disease and causative agents

All organisms contribute some water to the water cycle by conducting

Cells must be in osmotic equilibrium with their surroundings environments because if they swell or shrink thier membranes will rupture