Answer:
Red Blood Cell
Explanation:
Red Blood Cells (RBCs) are round and without a nucleus. It has no nucleus so that it has more space to accommodate oxygen molecules and it helps in diffusion due to the biconcave shape, and that biconcave shape is present because there is no nucleus present in the RBC.
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Magma that doesn't reach the surface is still called magma.
Mosses are classified as bryophytes. The statement that best describes mosses is; mosses are seedless plant. Hope this helps
Source-Wiki
Given the following choices
A. position of the carbon-carbon double bonds
B. presence of enclosed carbon atom rings
C. branching of the carbon chain
D. length of the carbon chain
The answers are; B, C & D. Carbon is a versatile atom (with a valence of +4) and is able to bond with other elements and other carbon atoms in different ways. It can form linear and branching chains of varying lengths. It can form double and single bonds with elements and form rings such as the deoxyribose sugars.