Many products and services were initially developed for space exploration. Which of these does NOT have a direct connection to space exploration? A. X-ray machine B. freeze-dried food C. infrared ear thermometer D. portable cordless vacuum

Why is the theory of evolution important? it disproves all other theories about how life began. it provides a topic for debate. it is a unifying concept in biology. it explains how life began. i know for sure, it is not "it is a unifying concept in biology."

Which best describes a gene? a. a sister chromatid b. a chromosome c. a tetrad d. a piece of a chromosome

Is becoming less expensive to screen blood samples for dna certain diseases have genetic basis what is possible ethical concern about the availability of inexpensive dna testing