Ascientist is investigating how the amount of available water affects plant growth in a rainforest. although all of earth's spheres are interconnected, which of earth’s spheres does the scientist’s investigation focus on?   the geosphere and the hydrospherethe hydrosphere and the biospherethe biosphere and the geospherethe geosphere and the atmosphere

the hydrosphere and the biosphere

The hydrosphere is the sphere which includes different regions occupied with water these includes oceans, lakes, ponds, rivers and even the water that seep inside the soil and rocks retain in the form of aquifiers and groundwater. The biosphere is the region of earth that is occupied with various life forms like flora and fauna.  

In the given situation, the available water for the plant growth in a rainforest is because of retention of rainwater in the grounds as aquifiers or groundwater utilized by plants for growth. These plants are the part of the earth's biosphere.

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

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