Answer:
A frogs heart has 3 chambers. Two atria and a single ventricle.
<span>(4) active transport
</span>Active transport is the movement of molecules across a cell membrane in the direction against their concentration gradient, i.e. moving from an area of lower concentration to an area of higher concentration.
Answer:
The goal of systematics is to organize living things into groups that have biological meaning. the science of naming and grouping organisms.
Explanation:
Answer:
The pancreas and gland cells of the small intestine secrete digestive enzymes that chemically break down complex food molecules into simpler ones. or Complete digestion takes place in the small intestine as it finally absorbs the nutrients. The end products of digestion are amino acids, fatty acids, glycerol, and glucose.
Explanation:
If you're talking about the end product go with the latter
Answer: Possession of Valves
Explanation: Veins possess valves which ensures that blood flows in only one direction. Valves helps blood to flow back to the heart against gravitational force.
Arteries don't have valves because the pressure originating from the heart is capable of causing the blood to flow in one direction.
