Examlex
Which of the following is the biggest obstacle to the development of new, more effective methods of contraception?
Biological Life Forms
Various types and structures of living organisms existing on Earth, ranging from single-celled bacteria to complex multicellular entities like humans.
Aquatic Organisms
Life forms, including plants and animals, that live in water environments, from oceans to rivers and lakes.
Macroevolution
Large-scale evolutionary changes that occur over geological time, leading to the emergence of new species and the extinction of others.
Evolutionary Changes
The alterations in the genetic makeup of populations over time, leading to the diversity of organisms found on Earth.
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