Two outwardly dissimilar groups, the ____________ and the chordates, together with a few other small phyla, constitute the deuterostomes.  

Fill in the blank(s) with the appropriate word(s).


echinoderms

Biology & Microbiology

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Which of the following is (are) specialization(s) that

evolved in land plants that was (were) unnecessary in their aquatic ancestors? a. xylem b. phloem c. stomata d. roots e. all of these

Biology & Microbiology

In mature compact bone, osteocytes become isolated from one another by the extracellular matrix, making it impossible for them to communicate with each other

Indicate whether the statement is true or false

Biology & Microbiology

The velocity of blood flow is the lowest in capillaries because _____

A) the capillaries have internal valves that slow the flow of blood B) the diastolic blood pressure is too low to deliver blood to the capillaries at a high flow rate C) the systemic capillaries are supplied by the left ventricle, which has a lower cardiac output than the right ventricle D) the total cross-sectional area of the capillaries is greater than the total cross-sectional area of the arteries or any other part of the circulatory system

Biology & Microbiology

Dormant, thick-walled resting cells of cyanobacteria that are resistant to desiccation are called ________.

A. akinetes B. baeocytes C. thylakoids D. hormogonia

Biology & Microbiology