Activation of B lymphocytes produces (antibody-mediated /cell-mediated/innate) immune responses.
Fill in the blank(s) with the appropriate word(s).
antibody-mediated
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Answer the following statements true (T) or false (F)
1. Hagfish are craniates but are not vertebrates. 2. A hagfish is a not a fish. 3. Lampreys' main body support is the notochord, not a vertebral column. 4. Sharks have cartilaginous skeletons because bone-forming ability had not yet evolved in vertebrates when they originated. 5. The swim bladder is an organ in primitive fish from which the lungs of terrestrial vertebrates developed.
Angiosperms have two types of xylem tubes, each composed of one cell type, either ____ or ____
a. vessel elements; companion cells b. sieve elements; companion cells c. sieve elements; tracheids d. vessel elements; sieve elements e. vessel elements; tracheids
In directional selection, both phenotypic extremes are equally selected against
Indicate whether the statement is true or false
The blastocoel is:
A) a fluid-filled cavity. B) the group of cells that form the archenteron. C) a fertilized egg. D) a hollow sphere of cells.