Lobe-finned fishes of the vertebrate class Sarcopterygii migrated out of fresh water and adapted to life on land and further amphibians were evolved from such fishes.
What are lobe finned fishes?
- Coelacanths, lungfishes, tetrapods, and their extinct ancestors, such as the osteolepiformes and panderichthyids, belong to the Sarcopterygii, or lobe-finned fishes.
- Together with ray-finned fishes (Actinopterygii), they make up the bony fishes (Osteichthyes).
- The fleshy pectoral and pelvic (paired) fins of sarcopterygians connect to the pectoral (shoulder) and pelvic (hip) girdles by a single bone.
- The coelacanths and lungfishes, which resemble fish more naturally, are examples of this. With the single bones standing in for the humerus (forelimb) and femur, these lobe-fins gave rise to the paired limbs of tetrapods (hindlimb).
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It’s either A or D depending on which side has a higher concentration of that molecule. If outside concentration is higher it will go from outside to inside. And if inside concentration is higher from inside to outside.
Glassy igneous rocks (i.e. obsidian) are cooled very rapidly.
<h2>Here are some characteristics:</h2><h3>
1 : rapid technological innovation;</h3><h3>
2 : large capital investments in order to apply production and management technology;</h3><h3>
3 : large-scale farms;</h3><h3>
4 : single crops/row crops grown continuously over many seasons;</h3><h3>
5 : uniform high-yield hybrid crops;</h3><h3>
6 : extensive use of pesticides, fertilizers</h3>
Answer:
c. pituitary gland
Explanation:
The hypo(below) thalamus is an almond size structure located superiorly to the brainstem. it is located below the thalamus. Hence the name hypothalamus.
It is primary function is is to control the body homeostatic functions of sleeping and waking up, sex, thirst and hunger etc.
It performs these roles by serving as the primary link of the nervous system with the endocrine system. Pituitary gland is an example of endocrine gland that secrets many hormones. (they are called endocrine because the hormones are secreted directly into the blood streams.
<u>Its activities are controlled by the nervous stimulation from hypothalamus. Therefore the instructions to secretes certain hormones to the post and anterior part of the pituitary gland depends on the hypothalamus.</u>
Growth hormones, oestrogen, and thyroid are examples of hormones of the pituitary glands.
