Tentative means possible
So a possible explanation of any matter on whuch you are working will be called astentative explanation which may be correct or incorrect
B double helix and linked with hydrogen bonds
The essential components of the human cardiovascular system are the heart, blood and blood vessels. It includes the pulmonary circulation, a "loop" through the lungs where blood is oxygenated; and the systemic circulation, a "loop" through the rest of the body to provide oxygenated blood.
Hope this helps!
Climate is defined as an area's long-term weather patterns. The simplest way to describe climate is to look at average temperature and precipitation over time.
On the basis of information in the paragraph above, the eggs should be able to be observed in Tp. Trichoplax adhaerens is the only extant representative of phylum Placozoa, which is a basal group of multicellular animals. Trichoplax are very flat organisms around a milimetre in diameter, lacking any organs or internal structures. They have two cellular layers, the top epitheloid layer is made of ciliated "cover cells" flattened toward the outside of the organism, and the bottom layer is made up of cylinder cells that posses cilia used in locomotion, and gland cells that lack cilia.
