Oxygen released by _____ accumulated in the atmosphere and produced the ozone layer
a. archaeans
b. aerobic bacteria
c. cyanobacteria
d. early eukaryotes
C
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Deaf individuals who receive a cochlear implant as adults typically do not regain as much of their hearing as people who receive the implants as young children. Why?
What will be an ideal response?
An unmanned spacecraft has been sent to another planet to detect other life forms that might be quite different from those on Earth. If the probe could only send back one still picture, which property or properties of life would be most evident?
In humans, which blood vessels have valves?
A) arteries in the neck B) arterioles C) capillaries D) veins
The Human Genome Project, which got under way in 1990, is an international effort to ________
A) clone deleterious genes from humans and study their mode of action B) collect plant seeds in order to reduce the impact of human activity on plant extinction C) collect samples of cells from all parts of the world in order to preserve human genetic diversity D) clone beneficial genes from humans for eventual use in gene therapy E) determine the base sequence of the human genome and to identify all the genes within