Answer:
The semilunar valves prevent backflow of blood into the ventricles.
Explanation:
The semilunar valves are valves found at the junction between the left ventricle and the aorta and also between the right ventricle and the pulmonary artery. They are cup-like in shape and prevent blood from flowing back into the ventricles which are the pumping chambers.
There are two types of semilunar valves. The aortic semilunar valves and the pulmonary semilunar valves. They are made up of the endocardial and connective tissue.
The closure of the semilunar valves causes the second heart sound detected on the stethoscope.
Diseases that arise from the semilunar valves are caused by its stenosis which is the narrowing of the valves and regurgitation where the heart valves can no longer hold firm enough to prevent the backflow of blood.
Explanation:
The Function of the Shoot System
The shoot system works closely in part to the root system of the plant. The shoots are able to absorb nutrients via the plant's different roots. The water and other nutrients that are taken in are shuttled up through the plant's vascular system located in the shoot
Answer:
Meiosis is a special type of cell division used by sexually-reproducing organisms to produce the gametes, such as sperm or egg cells. It involves two rounds of division that ultimately result in four cells with only one copy of each chromosome.
2 divisions
4
Asexual reproduction is a type of reproduction which does not involve the fusion of gametes or change in the number of chromosomes.
No genetic variation, all daughter cells are identical
Explanation:
Answer:
<h2>What is a biome?</h2>
A biome is an area classified according to the
species that live in that location . Temperature
range, soil type, and the amount of light and
water are unique to a particular place and form
the niches for specific species allowing scientists
to define the biome.
<h2>How does it relate to an Ecosystem?</h2>
<h3>Ecosystem</h3>
An ecosystem is a geographic area where plants,
animals, and other organisms, as well as weather and
landscapes, work together to form a bubble of life.
<h2>What biomes make up North America?</h2>
<h3>North American Biomes:</h3>
- Arctic & Alpine Tundra.
- Coniferous Forest (Taiga)
- Grassland (Prairie)
- Deciduous Forest.
- Desert Biome.
- Tropical Rain Forest.
- Urban Sprawl.
- Adaptations Links.
Explanation:
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