Explanation

Explanation

Explanation

Explanation

Angiotensin III is part of the renin-angiotensin system, which regulates blood pressure and fluid balance.

The juxtaglomerular cells, located in the kidneys, release renin in response to a decrease in sodium chloride concentration in the distal tubules.

Renin then catalyzes the conversion of angiotensinogen to angiotensin I,

Which is further converted to angiotensin II, and subsequently to angiotensin III.

This cascade helps in regulating blood pressure and sodium balance.

Explanation

The roundworm, also known as a nematode, is an invertebrate that possesses a pseudocoelom. 

Explanation

Explanation

Explanation

In the taxonomic hierarchy, the rank that comes directly below the class is the order.

The full hierarchy from broader to more specific categories is:

1. Domain
2. Kingdom
3. Phylum
4. Class
5. Order
6. Family
7. Genus
8. Species.

Explanation

Explanation

It is estimated that about 99.9% of all species that have ever existed on Earth are now extinct.

This figure underscores the vast extent of extinction events throughout:

• Earth's history
• reflects the dynamic 
• often unstable nature of life on the planet.

The remaining 0.1% of species are the ones that are still extant today.