Answer:
a. stevens hydroxyapatite combination is less than roger's
b. roger's skeleton underdoes less osteolysis than steven's.
c. roger's osteoblasts are more active than steven's.
Correct answer is d. all of the listed responses are correct
Explanation:
Roger has been lifting weights comparing to his twin brother Steven. Thus, all the given responses were related to compare both of their skeletons.
Answer:
Chitin.
Explanation:
The structure that is not a component of wall of sponges is Chitin. Their body comprise of calcareous or siliceous spicules or protein spongin fibres. Choanocytes are the distinctive cells located in the interior body walls of sponges. Sponges are similar to other animals in many characteristics such as they are multicellular, heterotrophic, lack cell walls and produce sperm cells in order to produce offspring sexually and also different from animals due to lack of tissues and organs.
Err give birth to live young?
mammals
good luck
<span>Cell, Tissues, Organs, Organ, System, and Organism.
Hope this helps
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