Horses and tapirs have a common ancestor, but now look very different. Horses now are grassland animals adapted for grazing on grass and shrubs. Tapirs are jungle animals that live in dense forests and eat fruit, leaves, and aquatic vegetation. Which of the following led to the development of such differences in the two species?
A. selective breeding
B. convergent evolution
C. DNA hybridization
D. natural selection
Ans: D. natural selection
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This is formed when an atom loses an electron to another atom.
A. polar covalent bond B. cations and anions that can form ionic bonds C. covalent bond D. hydrogen bond E. nonpolar covalent bond
The selective movement of specific small molecules and ions into excretory system tubules is called ____
a. reabsorption b. excretion c. filtration d. secretion
e. diffusionAlong with death, this decreases population size
A) Skin cancer
B) Carbon footprint
C) Age structure
D) Emigration
E) Desertification
F) Chlorofluorocarbon
G) Ozone
H) Carrying capacity
I) Density-dependent
J) Death rate
Which of the following conditions have been conclusively proven to be linked to childhood vaccinations?
A. autism B. asthma C. diabetes D. All of these choices are correct.