What is the key concept addressed by the question?
What will be an ideal response?
The question asks you to calculate the number of
neutrons from the atomic mass and number of an atom.
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Which of the following are important biotic factors that can affect the structure and organization of biological communities?
A) precipitation, wind B) nutrient availability, soil pH C) predation, competition D) temperature, water E) light intensity, seasonality
Annual growth rings are formed in woody stems principally through the activities of the ____
a. pericycle b. pith c. vascular cambium d. mesophyll e. endodermis
Which Lophotrochozoan phylum includes members that have highly segmented bodies with many repeating units that are usually separated by transverse partitions called septa?
a. Annelida b. Mollusca c. Platyhelminthes d. Rotifera
The alternation of circular muscle contraction and longitudinal muscle contraction allows the earthworm to move forward. What type of support system aids locomotion in the earthworm?
A. an endoskeleton B. a hydrostatic skeleton C. a calcium carbonate shell D. an exoskeleton