Answer:
A. Equal to cardiac output
Explanation:
Venous return refers to the rate at which blood flows back to the heart.
Averaged over a few heartbeats and over steady state conditions, venous return is equal to cardiac output. This is because the cardiovascular system is a closed loop made up of the pulmonary and systemic circulations.
The reason why the venous return must equal cardiac output is to avoid the accumulation of blood in one of the two circulations in the cardiovascular system.
Some of the mechanisms for venous return include;
1.) Exercise
2.) Gravity
3.) Thoracic pump and
4.) Pressure Gradient
5.) Skeletal muscle pump
A tree is one of the most common plants on Earth.
The answer is D the wave sound stretches out relative person starting still
<h2>Ecological species concept</h2>
Explanation:
Ecological species concept is the concept of species where species is a group of organisms adapted to specific resources,called niche in the environment
- Every species has a different niche;niche is simply the role played by the organisms in a particular area(environment) in which it is living
- Ecological and evolutionary processes controls the resources and divides the species into groups
- In the given example members of one population of wolf spiders are found in leaf litter within the woods while the other one is found in the grass at the edge of the woods
- Both the members are distanced from each other ecologically and their role to use resources changes
- Hence they are designated as two different species by utilizing the ecological species concept