Cumulative damage from reactive ________ is thought to be a major factor in aging
A) nitrogen
B) double bonds
C) isotopes
D) free radicals
E) helium
D
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What are the three types of muscle tissues in the human body? What are the two common functions of muscles?
What will be an ideal response?
John Musick and Julia Ellis have proposed that the ancestral reproductive mode for elasmobranchs was "yolk-sac viviparity
" That is, embryos were retained throughout their development in the oviducts of the female and emerged as miniatures of the adults (i.e., viviparity), but nutrition was provided by yolk that was deposited at the time the egg was formed, not from the mother during development (i.e., lecithotrophy, not matrotrophy). They suggest that oviparity (depositing eggs that develop outside the body of the mother) was associated with the evolution of small body size because it increased the fecundity of small species of elasmobranchs. What is their reasoning? That is, why would oviparity provide greater fecundity than viviparity for small species of elasmobranchs? What other factors might make one mode superior to the other?
What percentage of a person's skin would be involved if they had burned their left arm, front of the trunk, and the front of their left leg?
A. 45% B. 36% C. 40.5% D. 31.5%
An ion is an atom or group of atoms that has
A. a different number of neutrons than most atoms of that element.? B. lost or gained a proton.? C. lost or gained an electron.? D. a biological half-life due to radioactive decay.