Answer:Key stone
Explanation:
Keystone species hold together the complex web of relationships in an ecosystem. They can be animals, plants or microorganisms. Examples of keystone species include starfish, sea otters, wolves and elephants.
I think its A , Oil is a nonrenewable resource so its not D
Answer:
The given amount of a radioactive substance to disintegrate.
Explanation:
The correct order of development is after fertilization Zygote→Blastocyst→Embryo→Fetus. A zygote forms as a result of fertilization. It then rapidly divides, becoming a blastocyst, then an embryo, and finally a fetus.
- Zygote
- Blastocyst
- Embryo
- Fetus
<h3>What are the stages of fetal development?</h3>
- Fertilization.
- Blastocyst development.
- Embryo development.
- Development of the fetus and placenta.
If a enters the egg, fertilization takes place. Tiny cilia that line the fallopian tubes propel the fertilized egg (zygote) through the tubes to the uterus. The cells of the zygote divide several times as it travels through the fallopian tube to the uterus. The zygote enters the uterus within three to five days.
Once inside the uterus, the cells continue to divide and become a hollow sphere called a blastocyst. The blastocyst implants in the wall of the uterus approximately six days after fertilization.
With this information, we can conclude that A baby goes through several stages of development, starting with the fertilization of the egg. The egg develops into a blastocyst, an embryo, and eventually a fetus.
Learn more about stages of fetal development in brainly.com/question/465851
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