Earthworms are delicate. Careful handling is important to
avoid damaging the internal organs.
Place the worm with the dorsal side up. Start the dissection
2 centimeters posterior the reproductive segment. Snip the skin above the dorsal blood
vessel ( near the posterior pin) through
the septa to the mouth.
Answer:
C
Explanation:
Breaks are called faults, and the 2 tectonic plates at the fault move and they can squeeze together to form a mountain. They can also form earth quakes like that. Volcanoes can be formed by 2 tectonic plates that move apart
Answer:
The closing of the stomata is controlled by the guard cells.
Explanation:
When guard cells loses water, they shrink and become flacid and straight leading to the closing of the stomata.
Answer:
A food chain is a representation of what eats what in an ecosystem.
A combination of food chains is termed as a food web.
Example of two food chains in a food web are :
Example No 1:
Plant----- Grasshopper------ Frog---snake--- bacteria
Example No 2:
Plant---- rabbits---- fox---- bacteria
In a food chain, producers are usually plants and algae which are able to make their own food. Consumers feed on the plants. In example no 1, grasshoppers are primary consumers, frogs are secondary consumers, snakes are tertiary consumers.
In example no 2,plants are producers, rabbits are primary consumers and foxed are secondary consumers.
Decomposers are organisms that feed on the dead organisms in a food chain. In both the examples of food chain, bacteria are the decomposers.
