How are echinoderms uniquely different than other protostomes?
What will be an ideal response?
Echinoderms, as adults, are radially symmetric. Echinoderms have no excretory system or respiratory
system, and most have only a minimal circulatory system. The water vascular system, which they use
for locomotion, is unique.
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Local and state authorities can set standards for recreational water that are above or below the guidelines set by the United States government
Indicate whether the statement is true or false.
Alternative or different forms of the same gene
are called
a. homozygous. b. chromatids. c. alleles. d. homologous. e. karyotypes
Electrical signals are converted into chemical signals at the end of a(n) _____
a. neuroglial cell b. muscle cell c. microvillus d. neuron cell body e. axon
In the Northern Hemisphere, the summer ________ occurs when solar rays fall directly on the Tropic of Cancer
Fill in the blank(s) with correct word