Question

1- What two unique features do all (and only)mammals share?
Group of answer choices

hair and mammary glands

teeth and four chambered heart

endothermic and closed circulatory system

vertebrae and thoracic breathing

2- These aquatic filter feeding animals lack true tissues and organ systems.
Group of answer choices

sponges

jellies

sea stars

polycheate worms

3- These radially symmetrical aquatic animals have a specialized cell used for defense and prey capture that is unique to these animals.
Group of answer choices

jellies, hydra, coral and sea anemones

sponges

polycheate worms

crustaceans

4- These animals have little hair-like bristles that assist them in digging and anchoring and parapodia appendages on most of their segment which are used for crawling, swimming and anchoring.
Group of answer choices

polychaete worms

roundworms

flatworms

sea cucumbers

Answer 1

1. ans ) hair and mammary glands - these are mainly present in mammals

teeth and four chambered heart - incorrect- four chambered heart is also present in class aves ( birds ) also.

endothermic and closed circulation - incorrect - closed circulation is seen in phylum annelida onwards.

vertebrae and thoracic breathing - incorrect- vertebrate are found in class amphebia and aves also

2. ans ) sponges - they are belongs to lower group of phylum called porifera. they have cellular level of organisation and cells not organised in to tissues and organs. they eat tiny , floating particles along with water and filter the food from water .

jellies - incorrect- they have tissue level of organisation , belongs to phylum cnidaria.

sea star - incorrect- this belongs to phylum Echinodermata , have true tissue and organ system .

polycheate worms - incorrect- they belongs to phylum annelida , they have organ system level of organisation .

3. ans ) jellies , hydra, coral and sea anemone - these are radially symmetrical

sponges - assymetrical -incorrect

polycheate worms- bilateral symmetry- incorrect

crustaceans - bilateral symmetry-incorrect

4.ans ) polycheate worms - they are called bristle worms and each segments have a pair of fleshy protrusions called parapodia that bear many bristles called cheatae .

round worms - incorrect - no bristle like structures , they have hook like adapatation in its end

flat worms - incorrect - no bristle like structures , they have hooks and suckers

sea cucumber - incorrect- they have tentacles for food capturing