1) Lightning could be compared to which of the following? a
running water
b
a wave
C
a spark

b

Explanation:

Lightning could be compared to a wave.

Generally, light is considered to have two identities - particles and wave identities. Light is considered a particle because it is made of photon and it is considered a wave because it shows patterns of interference and can be diffracted/refracted/reflected with coherence and frequency just like any other wave.

The correct option is, therefore, b.

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.

c. establishing proper sleep hygiene