Both parents have to be heterozygous for the trait (Xx)
X. x
X. XX. Xx
x. Xx. xx
As you can see, in the further corner, there is a homozygous recessive genotype. (xx). This means that 1/4 of all offspring will have blue eyes. Or 25%
Water enter and leaves the cell by osmosis, which is a specific example of diffusion. <span />
An open circulatory system simply
means that the blood flows out of vessels and into the spaces or sinuses. Invertebrates,
insects and crustaceans has an open circulatory system where pump blood goes
into a hemocoel and diffusing back to the circulatory system between cells. In
other animals, the heart pumps the blood into the body cavities, spaces or
sinuses, where the blood surrounds the tissues.
In order to answer you would need to post an options list
Multicellular organisms use different types of cells to function not just one cell. If cells grew larger that cell would be more demanding.
