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Because a circulation is required early - as soon as diffusion no longer can carry materials throughout the body of the fetus.
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How do scientist use similarities in embryology as evidence for evolution?
Although the recapitulation theory in its intact form is rejected by modern scientists, there is still some validity to Ernst Haeckel's theory in that the embryos look similar during early stages of development and in time differentiate into their respective species/kingdoms. This supports the common ancestry part of evolution.What is "the recapitulation theory"; it 'rings no bells' here.
Where does the fruit form in a pollinated flower?
The fruit usually comes from the flowering part of the plant.
What is the meaning of morphogenesis?
The development of form in an organism during its growth. The evolutionary development of form in an organism or part of an organism. Morphogenetic adj.
Is embryo a gamete?
No. Embryos are created by the fusion of gametes. Once a sperm and egg cell have combined to form a zygote (which matures into an embryo) the resulting cell is no longer a gamete.
What reflexes form between neurons during development?
innate
What is gastsrulation?
Gastrulation is a phase early in the development of most animal embryos, during which the morphology of the embryo is reorganized to form the three germ layers: ectoderm, mesoderm, and endoderm.
Does echinoderms have a close evolutionary relationship with chordates?
Yes they do. Echinoderms, which include starfish, and chordates, which include humans are closely related in an evolutionary sense due to the way their embryos are formed in the early stages of development. Once past that point, the very obvious differences form.
How are embryos made?
An embryos is made when the fertilised egg cell divides in form a ball of cell which is an embryo.
Organum was an early form of what major musical event development?
polyphony
Organum was an early form of what major musical development?
Polyphony
What development was most important in helping early people to form settlements?
Because they was dirty
Which development most enabled early to form permanent settlements?
The creation of democratic government
What part of the ovary contains the embryo?
The ovary does not contain embryos - or if it does it is a medical emergency! The ovary is the site where immature eggs are stored and released. Fertilization of the egg to form embryos occurs outside the ovary, typically in the fallopian tube. Most of embryonic development occurs post implantation in the uterus. The ovary should never contain an embryo.
Organism at an early stage of its development?
An organism at an early stage of its development is referred to as an embryo. During this stage, the organism undergoes rapid cell division and differentiation to form various tissue layers and organs. The embryo is crucial for the development of the organism into its final form.
Congenital septal defects are holes that form in the septum during the embryonic development of the heart---resulting in the abnormal flow of blood from?
the left side of the heart to the right
What is the organism in its early stages of development especially before it has reached a disgtinctively recognizable for?
The organism in its early stages of development before it has reached a distinctively recognizable form is called an embryo. The embryo undergoes various stages of growth and differentiation before it develops into a more recognizable form of the organism.
Which stone Age development helpef people from relationships and resolve issues?
what is a development of the early stone age that gave people a way to form relationships or to resolve issues
