Answer:
Blood vessels
Explanation:
It is returned to the heart in the veins. The capillaries connect the two types of blood vessel and molecules are exchanged between the blood and the cells across their walls.
Answer:
These spheres are closely connected. For example, many birds (biosphere) fly through the air (atmosphere), while water (hydrosphere) often flows through the soil (lithosphere). This two-way cause and effect relationship between an event and a sphere is called an interaction.
Photosynthesis: Photosynthesis is an enzyme regulated anabolic process of manufacture of organic compounds inside the. chlorophyll containing cells from carbon dioxide and water with the help of sunlight as a source of energy.
A when volcanoes irrupt I think
Plants respire all the time, whether it is dark or light, because their cells need energy to stay alive. But they can only photosynthesize when they have light.
The oxidation of water occurs during photosynthetic electron transport during the light reactions of photosynthesis. In the absence of a source of light energy (dark reactions have no direct requirement for light energy), oxygen is not produced.