Explanation

The immediate next stage of spermatogonia differentiation is primary spermatocytes.

These cells undergo meiosis to eventually develop into secondary spermatocytes and ultimately mature into sperms.

Explanation

The remains or traces of living organisms from the past are called fossils.

Fossils provide evidence of prehistoric life and are preserved in sedimentary rocks.

Explanation

Virchow's node is the enlargement of the left supraclavicular lymph node 

It is considered by clinicians to be a strong indicator of metastatic abdominal malignancy.

Virchow's node is located medially and is a deep-seeded node

Making it difficult to assess a healthy individual

Explanation

In human myelinated fibers, nerve impulses travel at 100-120 meters per second.

Myelination increases conduction speed by allowing the impulse to jump between nodes of Ranvier in a process called saltatory conduction.

Explanation

According to the latest classification, Bryophyta is divided into three classes:

• Hepaticopsida (Liverworts)
• Anthocerotopsida (Hornworts)
• Bryopsida (Mosses)

Hepaticopsida (Liverworts):

The name Hepaticopsida comes from the word “hepatic” meaning liver.

Liverworts come under this class.

Hepaticopsida is further divided into 4 orders:

1. Marchantiales (e.g. Riccia, Marchantia)
2. Sphaerocarpales (e.g. Sphaerocarpos)
3. Calobryales (e.g. Calobryum)
4. Jungermanniales (e.g. Pellia)

Explanation

Instead of alveoli, birds (aves) have parabronchi.

Parabronchi are the structures in the avian respiratory system

They are the site of gas exchange, where oxygen from the air is absorbed into the bloodstream and carbon dioxide is released from the bloodstream into the air.

Birds have a unique respiratory system that includes air sacs connected to their lungs. 

Parabronchi are the functional units where gas exchange occurs within the avian respiratory system.

Explanation

During the repolarization of a neuron, potassium ions (K+) exit the cell.

This efflux of potassium ions along their electrochemical gradient causes the membrane potential

To become more negative, returning the neuron towards its resting state. 

Explanation

Explanation

Explanation