Biology Questions and Answers
environment for fecundation; the
problem oby direct contactf gas exchan of water ge, earlier with gills; thedone (^)
problem of body support, since it was
water that played this role in fishes.
Solutions for the dehydration problem:
thicker less water, and impermeable skin, to or moist and permeablelose
skin, like in amphibians. Solution for the
excretion p(also excreted by chondrichthyes) roblem: excretion of ureaor (^)
uric acid, substances that need less
water to be dissolved. Solproblem of protection against radiation:utions for the (^)
skin pigments that filter hradiation, feathers, hair or carapaces.armful (^)
Solution for the gamete movement
problem: ifor most amnternal fphibians, tecundation hat have external(except (^)
fecundation). Solution for the gas
exchange problem: aairways and lungs. Solppearing ofution for the body (^)
support problem: further development
of muscularlimbs and claws. and bony structures, like
- Amphibian identity card.
How are amphibians
characterized according to
examples of representing
beings, basic morphology,
skin, respiration, circulation,
nitrogen waste, thermal
control and types of
reproduction?
Examples otoads, salamanders. Basicf representing beings: frogs, morphology:
two pairs of limbs, eyelids,
hydrodynamic larvae. Skinpermeable, mucous glands. Respiration:: moist and (^)
cutaneous and pulmonary, branchial in
larval stage. Circulation: closed,
incomplete, heart with thrwithout interventricular seee champtum. bers
Nitrogen waste: urea. Thermal control:
heterothermic. Tysexual, water dependant, externalpes of reproduction:
fecundation and aquatic larval stage.
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