<span>This variation be justified by:
</span>Migration to an environment different from their birthplace, and adaptation to the available food, ultimately leading to speciation. because <span>birds use their beaks to eat.</span>.
A) Vibrations
Sounds vibrate the eardrum
Carbon dioxide is a colorless and non-flammable gas at normal temperature and pressure. Although much less abundant than nitrogen and oxygen in Earth's atmosphere, carbon dioxide is an important constituent of our planet's air. A molecule of carbon dioxide (CO2) is made up of one carbon atom and two oxygen atoms. Carbon dioxide is an acidic colorless gas with a density about 53% higher than that of dry air. Carbon dioxide molecules consist of a carbon atom covalently double bonded to two oxygen atoms. It occurs naturally in Earth's atmosphere as a trace gas.
Answer
cholesterol
Explanation:
Corticosteroids and sex hormones are derived from cholesterol through the same sterodoigenic pathway, with common metabolic intermediate, progesterone, and are under the control of the hypothalamus–pituitary–adrenal gland (HPA) axis (9).
Answer:
Adaptation is correct
Explanation:
Remember all the species changes little by little because of the genetic changes (like in this case) or because need to adapt the quantity of food (in some seasons like camels) or because they need to adapt to environmental conditions (like in hotter summers or colder winters in some regions).
In all these cases, the changes occurred through the pass of time and could be a result in changes in their morphology or physiology.
