Which organisms cause “red tides?”

(a) bacteria.
(b) cyanobacteria.
(c) euglenoids.
(d) dinoflagellates.


(d) dinoflagellates.

Biology & Microbiology

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Choose the true statement(s) about the evolutionary divergence of horses in North America. Check all that apply. 

_____ Most changes are seen as adaptations for life in grassland habitats. _____ The general trends during horse evolution are increase in body size, lengthening of limbs, reduction of digits on both sets of limbs, and tooth development for a grazing life style. _____ Horse evolution is unusual in that rates of change were uniform and constant throughout most lineages. _____ Living lineages of horses show much less diversity than existed in the past.

Biology & Microbiology

In spring, red-winged blackbird males return to their summer grounds where they compete for

territories prior to the arrival of females. This is an example of __________.

a. resource partitioning b. intraspecific competition c. niche overlap d. dominance hierarchy

Biology & Microbiology

Which of the following is a coenzyme?

A) NAD B) NADP C) FAD D) CoA E) All are coenzymes.

Biology & Microbiology

Scientists are now grouping reptiles with birds and mammals because they are all vertebrates that have a(n):

a. divided brain. b. amniotic egg. c. mammary gland. d. jointed appendage. e. epidermal covering.

Biology & Microbiology