Someseaurchins海胆havevenomous(toxin)spines
A、sensuous(feeling)Incalculatingthedailycalorierequirementsforanindividual,variationsinbodysize,physicalactivity,andageshouldbetakenintoaccount.
Someanimalspantandsweattospeedevaporationofbodymoistureandthuscoolthemselves.
ThefuturesurvivalofthebaldeagleisstillanimportantAmericanecologicalconcern.
Some animals pant and sweat to speed evaporation of body moisture and thus cool themselves.
The Salk vaccine is a major factor in the fight to eradicate polio.
