Biology Questions and Answers
- How is gas exchange done
in mammals?
Mammals breathe through lungs, their
respiration is pulmonary.
- How is circulation
characterized in mammals?
Mammals pcirculatory system.resent a close The heart has fd and complourete
chambers and the arterial blood does
not mix with venous blood.
- What is the type of nitrogen
waste that mammals
eliminate?
Like chondrichtian fishes and adult
amphibians, mammalsi.e., they excrete urea. are ureotelic,
- How do placental mammals
reproduce?
Placental mammalsthey have internal fecundation a reproduce sexually,nd they (^)
are viviparodevelops within us, i.e., ththe mother’s body andeir embryo (^)
from her it gets the nutrients throthe placenta. ugh
- Is fecundation in mammals
internal or external?
Fecundation in mammals is internal,
with coworld human technology is apulation. In the contemble toporary
promote artificial external fecundation
of human gametes and of gametes ofother animals. - Is the mammalian
embryonic development direct
or indirect?
In mammalsdevelopment is dir the embryonicect, without larval (^)
stage.
- Are there aquatic and
flying mammals?
Cetaceans (whales, dolphins) and
sirenians (daquatic mammals. Cugongs, manatees) hiropterans (bats)are (^)
are flying mammals.
- Are the limbs modified
into wings of bats and the
wings of birds examples of
evolutionary analogy or
homology? What about whale
fins compared to fish fins?
Bat and bird wings havfunction and the same orie the samegin (they are (^)
modified limbs) so they are analogous
and homologous organs. Whale fins area modification of the posterior limbs
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