What is the correct sequence of factors involved in blood clotting?
a. platelets → clotting factors → fibrin → fibrinogen
b. clotting factors → platelets → fibrinogen → fibrin
c. platelets → clotting factors → fibrinogen → fibrin
d. clotting factors → platelets → fibrin → fibrinogen

Which statement best describes the relationship between an allele and a gene? question 1 a. an allele is a variation of a gene that can be expressed as a phenotype. b. an allele is the part of a gene that attaches to messenger rna molecules. c. an allele is a segment of a dna molecule that controls replication of a gene.

Which of the following is one way in which organisms such as clown fish and sea turtles are able to overcome the many dangers that their offspring encounter and ensure that their species population numbers stay relatively steady

Can happen anywhere along the spine if the neural tube does not close all the way. the backbone that protects the spinal cord does not form and close as it should. this often results in damage to the spinal cord and nerves. a) cleft palate b) spina bifida c) encephalocele d) down's syndrome