Q.Find out p, q, r, s from the given tabulation.
Male organism | Female organism | Hybrid
Horse | Donkey | p
Donkey | Horse | q
r | Tiger | Liger
Tiger | Lion | s

The three meninges are the duramater, arachnoid and piamater; all three occur only in mammals.

Explanation:

• The brain and spinal cord (central nervous system) are covered and protected by connective-tissue membranes called MENINGES.
• The three meninges, from outside to inside, are:
  1. Duramater - the outermost, thick and tough protective membrane.
  2. Arachnoid membrane - the delicate middle membrane, with a web-like appearance (the subarachnoid space beneath it contains cerebrospinal fluid).
  3. Piamater - the innermost, thin, delicate and highly vascular membrane that closely covers the brain and spinal cord and nourishes them. …

p = Hinny, q = Mule, r = Lion, s = Tigon — each hybrid's name depends on which parent species is male and which is female.

Interspecific hybrids between closely related species are often given distinct names depending on the sex of each parent species:

• Row 1: Male Horse x Female Donkey -> the offspring of a male horse (stallion) and a female donkey (jenny) is called a HINNY. So p = Hinny.
• Row 2: Male Donkey x Female Horse -> the offspring of a male donkey (jack) and a female horse (mare) is called a MULE. So q = Mule.
• Row 3: Male ? x Female Tiger -> Hybrid: Liger. A Liger is produced by a male LION and a female Tiger (tigress). So r = Lion. …