Yolks are an important component of the eggs since they
nourish the young embryo as it develops into a young juvenile organism. The
yolk is important especially when the embryo is not attached to its parent (in
oviparous organisms) like in humans. Humans embryos are able to get their
nourishment directly from their mothers in the womb (through the placenta)
hence don’t require a yolk (viviparous organisms).
Answer:
B. 0.50
Explanation:
The estimated frequency of allele A in the gene pool is 0.50. Allele A is a variant form of gene which has different forms located at same position. Allele frequency determines common presence of genetic locus of an allele in the population. It is calculated by dividing the number of common allele that appears in the population by total number of copies of genes.
Answer:
The cartilaginous fish are jawed fish with paired fins, paired nostrils, scales, two-chambered hearts, and skeletons made of cartilage rather than bone. Examples of the cartilaginous fish include sharks, rays, and skates
Explanation:
Answer:
These findings led to the formation of the modern cell theory, which has three main additions: first, that DNA is passed between cells during cell division; second, that the cells of all organisms within a similar species are msotly the same, both structurally and chemically; and finally, that energy flow occurs within.
Flatworms will be best suited to terrestrial environment.
Explanation:
A 2 reasons flatworms live on land
The flatworms develop muscle tissues due to the mesoderm layer can easily move on the land hence suited for terrestrial life.
Flatworms do not have the digestive system they rely on food digested by the host.
They have sensory cells in their nervous system which help them recognize food.
B. 2 reasons why nematode don't live much on land
The roundworms or nematodes are the heterotrophs and often co-habitat as a parasite.
Nematodes feed on bacteria, fungi and protozoans from the soil or freshwater.
They require large internal pressure to move as no cilia or flagella are found in them.