Explanation

 The digestive system in animals develops primarily from the endoderm, with contributions from the mesoderm for certain structures.

The ectoderm plays a role in the development of the mouth and anus.

Explanation

Whales are classified as mammals because they have several key characteristics,

Including giving birth to live young, nursing them with milk,

Having three inner ear bones, and possessing hair (although sometimes very reduced). 

Explanation

Ants and bees contain formic acid in their sting, which causes pain and irritation.

While vinegar is a common home remedy for stings, this is due to its acetic acid content,

Which can neutralize the venom's effects by changing the venom's pH

Rather than being a component of the venom itself.

NaCl (common table salt) is not a component of either ant or bee stings. 

Explanation

Explanation

Aspergillus is a genus of fungi,

They are commonly found in soil, decaying vegetation, and some indoor environments.

Explanation

• Plants (made of cellulose),
• Bacteria (peptidoglycan),
• Fungi (chitin).

Explanation

In Ascidian embryos, the grey crescent gives rise to the notochord. 

The gray crescent:

• In ascidian development, the gray crescent is a region of pigmented cytoplasm located at the posterior of the fertilized egg.
• It is important for determining the future location of the notochord and neural tube. 

Notochord formation:

• The cells derived from the gray crescent are specifically destined to form the notochord, a rod-like structure that provides structural support during development. 

Explanation

• Hagfish belongs to the Cyclostomes (Cyclostomata), a group of jawless fishes.
• They are primitive vertebrates with a circular, jawless mouth.
• Hagfish live exclusively in marine (sea) environments.
• They feed mainly on dead or dying animals.
• Hagfish are famous for producing large amounts of protective slime.

Last verified on 02-08-2026

Explanation

 The trochophore larva is a characteristic larval stage found in several marine invertebrates.

Most notably within the phyla Annelida (segmented worms) and Mollusca (mollusks).

It is also present in other groups within the superphylum Lophotrochozoa, including entoprocts, nemerteans, echiurans, and sipunculans. 

Explanation

 The hormone that is not secreted by the anterior pituitary gland is Oxytocin. 

Oxytocin is secreted by the posterior pituitary gland, while the anterior pituitary secretes hormones

Like growth hormone, follicle-stimulating hormone, and adrenocorticotropic hormone