The adults live on land for part of the time and breathe both through their skin and with their lungs. Adaptations for land in amphibians include protective skin and eyelids that allow them to adapt to vision outside of the water.
<h3>
<u>Answer and explanation;</u></h3>
<u>Zone of resting cartilage</u> is nearest to the epiphysis and contains randomly arranged chondrocytes that do not divide rapidly.
<u>Zone of Proliferation</u> produce new cartilage through interstitial cartilage growth. Chondrocytes divide and form columns resembling stacks of plates or coins.
<u>Zone of hypertrophy.</u> The chondrocytes produced in the zone of proliferation mature and enlarge, the cells nearest the diaphysis are older and undergoing hypertrophy.
Thus, a maturation gradient exists in each column: The cells nearer the epiphysis are younger and actively proliferating, whereas the cells progressively nearer the diaphysis are older and undergoing hypertrophy.
<u>Zone of Calcification</u> is a very thin zone that contains hypertrophied chondrocytes and calcified cartilage matrix. calcified cartilage is replaced by bone.
The hypertrophied chondrocytes die, and blood vessels from the diaphysis grow into the area.
<h2>Energy allocation in penguin</h2>
Explanation:
- Although penguins don't grow from year to year, they increase and decrease in size as they repeatedly form and use energy stores,a significant amount of energy might be stored in fat during part of the year but be missing from the pie chart because it is used later in the year
- Allocation of limited endogenous resources causes trade-offs between competing traits, such as reproduction, somatic growth and maintenance
- During food deprivation, animals cannot maximize all of their life-history traits and must exhibit adaptive behavioral, physiological and biochemical responses to reduce metabolism and/or the cost of current activities in order to maintain biological value
