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What percent of human embryos are spontaneously aborted?
About half of human embryos are spontaneously aborted (that is, with no overt actions taken by the mother or others); see http://www.emcom.ca/health/abortion.shtml for more details.
Fruit Fly embryos and frog embryos differ from each other more than frog embryos and human embryos do What does this tell us about how the three species are related?
Fruit Flies and frog eggs are long-time,well characterized standbys in the lab environment,and specific manipulations allow researches to introduce genes from other organisms into these species
When can you tell the sex of a 'fetus'?
A baby has a sex long before it is a fetus. at the moment of conception, all DNA the human will have (sex, eye color, hair color, all gentic traits like that) is already present at that moment. Of course, actual reproductive organs come much later, but embryos do have genders
What type of embryos have pharngeal slits?
All chordates embryos have pharngeal slits.
What two things do all growing embryos need?
the 2 things that ALL growing embryos need are food and oxygen
What is the human male sex hormone?
Testosterone is most important human male sex hormone . there are many varieties of it but all are cholesterol derivatives .
What are all good habits for human begin's?
Correcting idiots for misstyping "Human Beings".
Do all organisms start out as embryos?
No, not all organisms start out as embryos. Embryos are typically seen in higher animals that undergo sexual reproduction, where a fertilized egg develops into an organism. Organisms like bacteria and protists reproduce asexually and do not have an embryonic stage in their life cycle.
Do early chick and pig embryos have a similar structure and appearance?
The early embryos of all animals have a very similar appearance. This is no different for chicken and pig embryos.
What sex chromosomes does a female have in all her cells?
A female human has two X sex chromosomes in her cells. A male human has one X and one Y sex chromosome in his cells.
How are vertebrate embryos evidence of evolution?
All vertebrate embryos look roughly the same, showing that they come from a common ancestor.
What types of embryos have pharyngeal slits?
all chordates
