A "Weightless" Astronaut in an Orbiting Shuttle Is

question 50

Multiple Choice

A "weightless" astronaut in an orbiting shuttle is

• A)shielded from Earth's gravitational field.
• B)beyond the pull of gravity.
• C)pulled only by gravitation to the shuttle which cancels Earth's gravitational pull.
• D)like the shuttle, pulled by Earth's gravitation.
• E)none of the above

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Definitions:

Epidermis

Outermost tissue layer. In animals, the epithelial layer of skin. In plants, the dermal tissue.

Mesoderm

Middle tissue layer of a three-layered animal embryo.

Ectoderm

Outermost tissue layer of an animal embryo.

Implantation

The process by which a fertilized egg attaches itself to the lining of the uterus, marking the beginning of pregnancy.