ANIMAL REPRODUCTION Flashcards
give birth to their young alive.
Placental mammals
are viviparous and bear their young alive.
Marsupials
are oviparous and
eggs like the reptiles
monotremes,
the most primitive mammals
monotremes,
At the early stage of its development,
the young crawls into its mother’s pouch called
marsupium
evolutionary adaptation that allowed fertilized eggs to develop on dry land evolutionary adaptation that allowed fertilized eggs
to develop on dry land
Amniotic egg
lay their eggs on land
Reptiles
Spiders, insects, centipedes, scorpions, shrimps, crabs, and lobsters
arthropods.
process of transforming in a
different shape and form.
metamorphosis
the young look like the
adults.
incomplete metamorphosis
gradually acquire adult structures such as wings and functional sex
organs.
Nymphs
These insects lay eggs that hatch into larvae that look different from
the adults
complete metamorphosis
(gastropod), scallops (bivalve), and squids (cephalopod).
Mollusks
Marine worms, earthworms and leeches
ANNELIDS
they have both male and female sexual organs
hermaphrodites
