All vertebrates ( including humans ) have the same basic body plan they are strictly bilaterally symmetrical in early embryonic stages and largely bilaterally symmetrical in adulthood.
42.
The researchers suggest that crickets evolved from a bilaterally symmetrical ancestor, becoming asymmetric over time as courtship behavior evolved ( the chirps being essentially love songs ).
43.
The flowers are held so that they are more or less horizontal; the upper side is different from the lower side ( bilaterally symmetrical or zygomorphic ).
44.
Nearly all are bilaterally symmetrical, or approximately so; the most notable exception is the echinoderms, which achieve near-radial symmetry as adults, but are bilaterally symmetrical as larvae.
45.
The flowers are held at a constant angle somewhat above the horizontal with the higher side different from the lower side ( zygomorphic, specifically bilaterally symmetrical ).
46.
All vertebrates ( including humans ) have the same basic body plan they are strictly bilaterally symmetrical in early embryonic stages and largely bilaterally symmetrical in adulthood.
47.
Nearly all are bilaterally symmetrical, or approximately so; the most notable exception is the echinoderms, which achieve near-radial symmetry as adults, but are bilaterally symmetrical as larvae.
48.
At day 22, the circulatory system is bilaterally symmetrical with paired vessels on each side and the heart consisting of a simple tube located in the midline of the body layout.
49.
Ranging in size 15 cm and below, they have dorsalventrally flattened, oval bodies and secondarily bilaterally symmetrical, platyctenids look very much like nudibranchs or flatworms and are often confused for them.
50.
Our bilaterally symmetrical ancestors had need for a lot of sensory and motor nerves in the front of the body and connections between them because that was the part that met food and enemies first.
