A compass
The Earth's magnetic field, provided by the magnet in a compass, shows the direction of the north and south poles.
ANSWER MADE BY AN AI
Natural selection is need for evolution to occurs according to Darwin's theory
Answer:
B. Members of Plantae and some members of Protista are autotrophs.
Explanation:
All the plants and some protists like euglena are autotrophs i. e. make their own food with the help of chloroplast in the process of photosynthesis. All members of kingdom Plantae cannot move from one place to another like animals. Protists are the organisms which is made of one cell and they have the characteristics of fungi, plants and animals.
Answer: Valves in the veins
Explanation: The flow of the blood inside the body takes place through the veins and arteries. The oxygenated blood from the heart is supplied to the different parts of the body.
The blood flows from the capillaries to the venules and from there to the veins. The blood moves in the veins by the rhythmic movement of the smooth muscles in the body.
Most of the blood moves against the gravity so there is a chance that it can backflow so to prevent this there are valves in the veins known as one way valves.
Pyroclastic flows,lava flows and lahars are hazardous. Geothermal energy is beneficial.
Volcanic ash and volcanic materials can be both hazardous and beneficial.
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