Explanation

An isthmus is a narrow strip connecting two larger land masses and separating two bodies of water.

Explanation

The term "cosmic" pertains to the universe, space, and celestial phenomena.

Explanation

 Rainbows occur when sunlight is refracted, reflected, and dispersed in water droplets, creating a spectrum of colors.

When light meets a water droplet,

It is refracted at the boundary of air and water, and enters the droplet

Where the light is dispersed into the seven colors

Explanation

Global warming began to accelerate with the advent of the Industrial Revolution, due to increased greenhouse gas emissions.

Since the start of the Industrial Revolution, in about 1750,

Human activities  have increased greenhouse gas concentrations in our atmosphere. such as :

• burning fossil fuels
• including coal and oil
  

Explanation

The word "Fungus" is derived from the Latin word for "Mushrooms".

It referring to a group of spore-producing organisms that include molds, yeasts, and mushrooms.

Explanation

Malady means disease.

It refers to a physical or mental illness or disorder.

It often a serious or chronic one.

Explanation

A dermatologist is a medical doctor who specializes in conditions that affect the skin, hair, and nails.

Dermatology means ماہر امراض جلد 

Explanation

Cytosine does not form a bond with adenine because its hydrogen bond donors and acceptors are not complementary.

Cytosine typically forms three hydrogen bonds with guanine, whereas adenine forms two hydrogen bonds with thymine.

The patterns of hydrogen bonding in cytosine and adenine do not match, preventing the formation of a stable pair.

Explanation

The statement that tropical rainforests accumulate more organic matter on the forest floor than temperate grasslands is incorrect.

In reality, the decomposition rate in tropical rainforests is so rapid due to high temperatures and humidity that organic matter does not accumulate significantly on the forest floor.

In contrast, temperate grasslands may accumulate more organic matter over time due to slower decomposition rates caused by cooler temperatures and seasonal variations.

Explanation

When crossing an organism with genotype Aa (heterozygous) with one that has genotype aa (homozygous recessive), the offspring can inherit either the A or a allele from the Aa parent and only the a allele from the aa parent.

This results in a 1:1 ratio of genotypes, with half of the offspring being Aa (heterozygous) and the other half being aa (homozygous recessive).

The incorrect ratio of "1/2 Az & 1/2 aa" mentioned in the question is likely a typo.