The main systems associated with communication with the body are the _______________
systems.
a. nervous and endocrine
b. nervous and circulatory
c. immune and endocrine
d. endocrine and circulatory
A
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Which of the following correctly displays the sequence of developmental milestones?
A) blastula ? gastrula ? cleavage B) blastula ?? cleavage ? gastrula C) cleavage ? gastrula ? blastula D) cleavage ? blastula ? gastrula E) gastrula ? blastula ? cleavage
The normal human microbiota is considered part of the 1st line of defense because
A. microbiota cause an inflammatory response, eliminating pathogens. B. resident bacterial cells stimulate phagocytosis of pathogens. C. microbial antagonism keeps potential pathogens in check. D. pathogens and normal biota cannot exist in the same location.
The secondary plant cell walls contain large amounts of lignin, which is a polymer of amino acids. Indicate whether the statement is true or false
The scanning electron microscope cannot take precise measurements of elemental concentrations in glass fragments because of the ______ of the glass fragments.
What will be an ideal response?