Explanation

Hirudinaria is a genus of leeches, which are segmented worms.

Leeches belong to the phylum Annelida, known for segmented bodies.

Explanation

Parasites are classified as ectoparasites (living on the surface) and endoparasites (living inside the host).

Both types represent different forms of parasitic symbiosis with their hosts.

Explanation

Aldehydes and ketones contain a polar carbonyl group (C=O) which is susceptible to nucleophilic attack.

They commonly undergo nucleophilic addition reactions, a key feature of their reactivity.

Explanation

Blood type O has no A or B antigens on the surface of red blood cells.

That's why type O is known as the universal donor in blood transfusion.

Explanation

"The" is used for something specific already known to the speaker and listener.

Since the USB drive was already mentioned ("I lent you last week"), "the" is correct.

Explanation

Monosaccharides are the simplest form of carbohydrates.

They are called simple sugars because they cannot be broken down into smaller sugar units.

Explanation

Boron is a metalloid, showing properties between metals and non-metals.

Aluminum is a metal.

Phosphorus is a non-metal.

Explanation

Nickel is a micronutrient essential for the activity of the enzyme urease, involved in nitrogen metabolism.

It helps in converting urea into usable forms of nitrogen for plants.

Explanation

Answer means a reply or response, usually cooperative.

Defiance means refusal or resistance to respond or obey.

Answer means جواب

Defiance means انکار

Explanation

Carboxylic acids contain the carboxyl group (–COOH), which gives them their acidic properties.

This group consists of a carbonyl (C=O) and hydroxyl (–OH) bonded to the same carbon atom.