Answer:
gills
Explanation: A fish without a jaw was the first vertebrate to evolve. These fish used filtration to capture their food and sucked water and debris from the sea through their mouths and then released the water and trash through their gills. Some features are as follows:
1. They have a notocorda that serves as support through the back of the fish.
2. Gill bags. These organs are responsible for filtering the oxygen in the water.
3. A pineal eye that is sensitive to light
4. A cartilaginous skeleton
Explanation:
it is an endothermic process
Hope I helped
Answer:
I see an apple tree in my yard every day. I know that it is a plant because it has a root, stem, leaves, flowers, and fruit.
Explanation:
Hope this helps!!!! :D
Answer:
आप क्या कह रहे हैं भाई मुझे समझ में नहीं आया क्या यह सवाल है
The right answer is vein (it contains blood and has valves).
The infra-cardiac veins of small and medium caliber possess this system of fight against gravity. The valves consist of a dense connective tissue, surmounted by endothelial cells, corresponding to a fold of the intima. They allow blood circulation in the sense organ / heart but prevent venous reflux.
