1. A plant cell has chloroplasts
2. A plant cell has a cell wall
3. A plant cell has vacuoles
An animal cell has none of these features.
Answer:
The Digital signal is less vulnerable to noise and more likely to arrive intact
The Digital signal can be copied many times without losing quality
Explanation:
ApE-x
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1. Plastic water
2. Air pollution
3. Toxic Sludge dumping
Answer:
Correct answer is C.
The star must be 29 times larger than Earth's sun, and a supernova explosion must have occurred.
Explanation:
A black hole is a giant, gaseous and huge structure present in the space.In physical appearance, it ca be 29 times more massive and bulky than the sun. The black hole pulls energy and matter from the surrounding galaxies and is becoming enormous in size day by day.
Moreover, a black hole pulls light from its surrounding matter with so much gravity that it gets trapped and can not escape from it. Stellar is a kind of black hole which emerges when a big star collapses or falls in automatically. When it occurs an exploding star "supernova" is formed which bursts out into an explosion.
Elephant tusks are considered to be enlarged and elongated incisors. One third of the tusk is usually located deep inside the elephant's head while the remaining two third of the tusk can be seen outside. The part of the tusk located in the elephant's head is made up of tissues, nerves and blood and it is called pulp cavity. The outside part of the tusk is made up of dentine with an outer cover of enamel. Elephants use their tusks as weapons of fighting and it is also used for foraging and digging.
