I think the answer is A, blood would leak backwards through the damaged valves due to gravity, causing lower leg swelling. The main function of the valves in veins is to prevent back flow of blood. Blood in the arteries, after being pumped by the heart, are under much higher pressure than blood in veins so there is no need for arteries to prevent back flow. However, within the veins especially those of legs are valves for the above function, therefore damaged valves would cause some back flow of blood, causing swelling of the legs.
Farming, Food, and Medicine are a few things fungi can be useful for. <span />
Answer:
1. Archaea
2. Binomial nomenclature
3. Eubacteria
4. Eukaryote
5. Morphology
6. Prokaryote
7. Reproductive isolation
Explanation:
Archaea are microorganisms without a cell nucleus (i.e., prokaryotes), which were originally classified as Archaebacteria. Nowadays, procaryotic organisms are classified into two domains: Archea (Archaebacteria) and Bacteria (Eubacteria). These organisms are characterized by the lack of membrane-bound organelles. On the other hand, the domain Eukaryota consists of organisms that have their nuclei enclosed by a membrane. This domain is divided into four kingdoms: Protista, Plantae, Fungi and Animalia. Binomial nomenclature is a classification system to name species, where the first word of the name indicates the genus of the species and the second part of the name indicates the species within the genus. Finally, reproductive isolation is a term used to indicate physiological, mechanical, behavioral and geographical barriers that prevent interbreeding between two different species.