Explanation

light blue litmus paper turning red under acidic conditions 

Red litmus paper turns blue under basic or alkaline conditions.

Purple litmus paper is neutral.

At pH levels of 0.0 to 4.5, the solution turns a red color;

At pH levels of 8.3 to 14.0, it turns a blue color.

Explanation

Answer: D

The disease affects cattle, pigs, sheep, goats, and other ruminant ungulates. Intensively bred animals are more susceptible to disease than traditional breeds.

Explanation

Overall, the Earth is about 1.59% aluminium by mass

Explanation

Heredity refers to the genetic heritage passed down by our biological parents. 

Explanation

It is made of O3 

Oxygen layer in atmosphere

Ozone protects us from the harmful ultraviolent radiations of the sun.

Ozone formula : O3

Explanation

Lead is a chemical element.

Symbol Pb  and atomic number 82.

It is a heavy metal that is denser than most common materials.

Explanation

Correct answe:

C

Explanation

Answer:

B

According to Archimedes' principle, when an object is completely or partially submerged in water, the water moves according to its volume. The body swims in the water when its weight is lighter than the weight of the same amount of water. If its weight is equal to the weight of the same amount of water, it remains floating.

Explanation

Average temperature for Wednesday, Thursday and Friday = 40° C

Total temperature = 3 × 40 = 120° C

Average temperature for Thursday, Friday and Saturday = 41° C

Total temperature = 41 × 3 = 123° C

Temperature on Saturday = 42° C

Now,

(Thursday + Friday + Saturday) - (Wednesday + Thursday + Friday) = 123 - 120;

Saturday - Wednesday = 3

Wednesday = 42 - 3 = 39° C

Explanation

Scientists at NASA have detected water vapour for the first time above the surface of Europa, a finding that supports the idea of a liquid water ocean sloshing beneath the miles-thick ice shell of the Jupiter's moon.