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.
The answer is,Different animals with similar structures:)
Answer:
A keystone species is an organism that helps define an entire ecosystem. Without its keystone species, the ecosystem would be dramatically different or cease to exist altogether. ... Any organism, from plants to fungi, may be a keystone species; they are not always the largest or most abundant species in an ecosystem.
Answer:
(Have a nice day)
¶Emma Jess¶
Explanation:
Two or more tissues operating together.
MORE INFORMATION;
Cell is that basic unit of life.
Group of cells working together a specific function of tissue.
So, organs are two more tissues operating together. So hope u can get sense..
the answer is 100 grams. the formula for finding mass is density x volume.
i hope this helps!
