When a blood vessel is damaged, platelets adhere to the damaged site and release chemicals, which attract additional platelets. Thus, platelet attraction is considered to be a ________ feedback mechanism
Fill in the blank(s) with correct word
positive
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Females outnumber males in the tertiary sex ratio because genetic and ____________________ factors cause higher death rates among males
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About ____ percent of the 295,000 known
species of flowering plants coevolved with animal pollinators. a. 50 b. 60 c. 70 d. 80 e. 90
A chemical produced by one animal that is usually only detectable by another animal of the same species is called a
A) releaser. B) subliminal suggestion. C) pheromone. D) hormone. E) neurotransmitter.
A karyotype:
A) shows chromosomes as they appear before replication. B) can show the number of chromosomes in a cell. C) can reveal the location of a gene. D) can reveal the presence of cancerous genes.