In contrast to compact bone, spongy bones does not contain true Haversian systems( tiny tubes that form a network in bone and contain blood vessels) but consist of an irregular lattice of thin plates of bone called trabeculae.The spaces between trabeculae are filled with marrow. The cells of the red marrow are responsible for producing blood. Within trabeculae lie lacunae which contain osteocytes.<span> Blood vessels from the periosteum penetrate through to the spongy bone, and osteocytes in the trabeculae are nourished directly from the blood circulating through the marrow cavities.</span>
Answer:
solid, naturally occurring, inorganic, fixed composition, crystal form.
Explanation:
Answer:
C
Explanation:
Pluto is not the smallest orbiting body (which includes comets, asteroids, and moons), pluto is the smallest orbiting planet
All planets have an elliptical orbit, not just pluto
Pluto has several moons
Therefore, the right answer is C
Answer: Food worker should let the dish dry (with the help of tissue paper to avoid any growth of germs on wet surface) after rinsing and also they should sanitize their hand in order to maintain proper hygiene.
Doing so can reduce the level of surface contamination on dishes (by microbes such as bateria, and viruses).
There should be proper hygiene in preparing and serving food otherwise food may cause illness to people.
Answer:
(A): DNA and protein
(B): The case for proteins appeared stronger until the 1940s, especially since biochemists had identified them as a class of macromolecules with great heterogeneity and function specificity, essential requirements for the hereditary material. Moreover, little was known about nucleic acids, the physical and chemical properties of which seemed far too uniform to account for the multitude of specific hereditary traits of each organism
(C): Virulent strains are pathogenic (causing disease), whereas non-virulent strains are non-pathogenic (harmless) strains.
