(a) Wall lizard found in our houses is not poisonous.
(b) It eats insects. The ordinary wall lizard are equipped with vacuum-cupped toes which enable the lizard to chase insects along vertical walls and ceiling of rooms.
(c) Sheela's mother avoided the cruelty toward the animals, cleared misconcept and avoid disturbing the natural food chain.

Vertebrata are classified into further subgroups on the basis of simple to complex form and function of the organisms.
For example, fishes have two chambered heart, amphibians and reptiles have three chambered heart where as aves and mammals have four chambered heart to keep oxygenated and deoxygenated blood separately.

Conventions followed while writing the scientific names are:
(i) The name of the genus begins with a capital letter.
(ii) The name of the species begins with a small letter.
(iii) When printed, the scientific name is given in italics.
(iv) When written by hand, the genus name and the species name have to be underlined separately.

(i)  Jellyfish     - Phylum Coelenterata
(ii) Earthworm - Phylum Annelida
(iii) Cockroach - Phylum Arthropoda
(iv) Rat            - Phylum Vertebrata Class-Mammalia

Characteristic features of Animals:
(i) They are mobile and ingest food i.e, they depend on plants or other animals for food.
(ii) They stop growing after maturity.

Characteristics of Animalia:
(i) These organisms are eukaryotic and do not have cell walls.
(ii) They have multicellular body.
(iii) They are heterotrophic.
(iv) Most of the them are mobile.

Phanerogams. These plants which have well differentiated reproductive tissues and bear seeds are included in phanerogams. Their plant body is differentiated into root, stem, and leaves. They also have well developed vascular system (xylem and phloem). They have multicellular sex organs. Their embryo develops from a fertilized egg.

1. Species will have the smallest number of organism with a maximum of characteristics in common.
2. Kingdom will have the largest number of organisms.

Kingdom Monera. The organisms which are unicellular and do not have a membrane bound nucleus and cell organelles are put under Monera. For examples, Bacteria, Cyanobacteria, etc.
Kingdom Protista. The unicellular organisms which have membrane bound definite nucleus and cell organelles are grouped under the kingdom Protista. Example-Protozoa like Amoeba diatoms, etc.

Aristotle classified animals on the basis of habit. For example, corals, whales, octopuses, star fish and sharks live in sea. These are very different from each other in many ways. Except habitat, they do not share other similarities. This way is not good for making groups of organisms to study and think about.

Range of Variations
(i) Life span-Mosquitoes live for a few days whereas cow, dog, etc. live for many years.
(ii) Colour-Some organisms like certain cows, horses, dogs are white but some birds and flowers are brightly coloured.
(iii) Size-Some organisms are so small that we cannot see them with naked eyes. On the other hand, eucalyptus tree is several metre tall.