- المجال: Government
- Number of terms: 30456
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NOAA Coral Reef Conservation Program, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
The opening into the archenteron (primitive gut) of a gastrula. In some animals it develops into the mouth and, in others, into the anus.
Industry:Natural environment
A branch of biology that deals with the geographical distribution of organisms.
Industry:Natural environment
A DNA sequence that is located in front of a gene and controls gene expression. Promoters are required for binding of RNA polymerase to initiate transcription.
Industry:Natural environment
A linear spicule in sponges; a single rod or ray with a pointed, hooked, or knobbed end.
Industry:Natural environment
A polluting substance that is not broken down by natural processes.
Industry:Natural environment
A spandex textile fiber which has unique elastic qualities in that it can be used in very lightweight, durable fabrics of long-lasting elasticity. It has excellent tensile strength, a long flex life, and high resistance to abrasion and heat degradation. Lycra skin coverings are popular with scuba divers as they give some protecion against abrasions and jellyfish and fire coral stings. They also offer (minimal) protection against cold .
Industry:Natural environment
A type of reproductive behavior found in hermaphroditic flatworms (some have two penises and one or more genital pores for receiving sperm cells delivered during copulation). During penis fencing, each flatworm tries to pierce the skin of the other using one of its penises. The first to succeed becomes the de facto male, delivering its sperm into the other, the de facto female.
Industry:Natural environment
