Answer:
refractory period is the correct answer.
Explanation:
A refractory period happens when the muscle and nerve are unable to respond to the additional stimulation temporarily.
A refractory period occurs because sodium ions channels are not activated during this period.
The refractory period differs among the individuals, it ranges from minutes to a day.
During this period many are temporarily not interested in sexual activity and their penis can be hypersensitive or some of the men are not able to sustain an erection during this period.
Extremophiles are organisms that can live and thrive in extreme environments, such places can have high pressure and temperature, just like the organisms in hydrothermal vents. The benefits of being an extremophile is less risk for predation since not much predators can live in extreme environment; there will also be less competition in term of food source.
By using microscopes scientists were able to discover the existence of microorganisms, study the structure of cells, and see the smallest parts of plants, animals, and fungi.
Answer:
Explanition:
The immune system is made up of special organs, cells and chemicals that fight infection (microbes). The main parts of the immune system are: white blood cells, antibodies, the complement system, the lymphatic system, the spleen, the thymus, and the bone marrow.
Biosphere is one of the layers surrounding the earths surface where life exists. It represents the ecological system intergrating living things and their interactions with the environment relating to the other layers (hydrosphere, atmospheres, geosphere and the lithosphere). Photoautotrophs are organisms that make their own food using sunlight in a process called photosynthesis. They are responsible for the food supply in the biosphere.
