A: Why do sea urchins have external fertilization? [Discuss the life style of the developing sea urchin embryo in the water column compared to a very different ecological niche of the adults on the ocean floor. Besides, would you want to give live birth to a sea urchin! ouch!] 2: Then why don't the parents take care of the young? [In fact the adults do in a way. After the embryo has grown large enough and metamorphosed into a young urchin they hide in the spines of the adults, living off of the scraps of food produced from the messy eating of the adults] 3: Because the urchin life involves two or more ecological niches, they are more susceptible to predation and exposure to environmental toxins. What environmental conditions, predators and toxins might they be exposed to at each stage?

Q: Name the process of development of egg into young one without fertilization?

A: The above-mentioned definition is true for parthenogenesis. It is a type of asexual reproduction…

Q: Describe the movement of cells during early development that change an embryo from a blastula to a…

A: To describe: The movement of cells during early development that changes an embryo from a blastula…

Q: +Describe the process of implantation of the embryo, what cells are involved and their roles.…

A: Implantation is the process where the blastocyst attaches to the endometrium of the uterine cavity.…

Q: What structure provides oxygen to the growing organism? placenta uterine wall embryonic disk neural…

A: Fertilization is the process of fusion of male and female gametes that takes place inside the…

Q: 1)Development is just another name for fertilization a)True b)False 4)A fertilized egg is the same…

A: Fertilization is a term used to denote the fusion of male gamete i.e. sperms/pollens with the female…

Q: Briefly describe viviparity and ovoviviparity and compare the embryo's source of nourishment, their…

A: There are  two different methods of fertilization of male and female gametes. It is external…

Q: 1. Draw an annotated diagram of a fetal pig (one external picture and one internal picture), making…

A: Fetal Pig Internal Picture and external picture:

Q: What's the difference between ovum, primary oocyte, secondary oocyte and oogonia?

A: In the human body, the reproductive process gets initiated by the formation of male gamete(through…

Q: Briefly discuss avian early embryonic development, starting with fertilization and oviposition,…

A: Introduction  The life starts from single cell called Zygote. A zygote is formed by the fusion of…

Q: 3. During the course of successful prenatal development, a human organism begins as a(n): A) Zygote…

A: The goal of developmental biology is to comprehend how an organism develops—how a single cell…

Q: -3. The figure below shows cleavage stages in an embryo. From studying the photographs, what can you…

A: On fertilization, the zygote undergoes cleavage. That is the process of development of multicellular…

Q: Which of the following follows fertilization in Xenopus embryos? Calcium waves cause non-yolky…

A: Fertilization in xenopus embryos is  mainly complex multi-step process that completed in 24 hours.…

Q: In terrestrial arthropods, fertilization is always internal (True/False)?

A: Arthropoda is the largest phylum in the animal kingdom, which includes such familiar forms as…

Q: In Deuterostomes, nutrient molecules (monomers) are taken in to the space between the endoderm and…

A: Option (a) is incorrect because, in Deuterostomes, nutrient molecules (monomers) are taken up into…

Q: 3) List the stages of development once the egg is fertilized. (When a woman and a man have sexual…

A: Human embryonic development, or human embryogenesis, refers to the development and formation of the…

Q: Match the germ layer to its derivative Neural tube V [ Choose ] Ectoderm Endoderm Mesoderm…

A: Cells of Germ layers grow and divide to produce different parts /organs of body of an organism.

Q: Describe and label a nematocyst and the cell containing it. Describe how nematocysts fire. How does…

A: Nematocysts are characteristic features of Cnidarians. These specialized cells are used for…

Q: List the organs the fertilized egg travels through on its journey to implantation (from the ovary to…

A: Ovaries are the  primary female sex organs that produces the female gamete and several steroid…

Q: What's the process of gastrulation in humans, how the embryo forms the three germ layers, and which…

A: The inner cell mass which is known as Blastula is now grown into a cell mass known  Gastrula and…

Q: Which of the following is the latest stage of embryonic development (of this list)? blastula morula…

A: The development begins after fertilization which involves formation of zygote. After this zygote…

Q: S 138. A male newborn has albinism. The most likely cause of the lack of pigmentation in this…

A: The objective of the question is to identify the origin of the cells that are most likely…

Q: Explain the following terms: ectoderm, endoderm, mesoderm and stem.

A: Animal phylogeny is a rapidly changing field. The biologists mostly depend on the fossils to compare…

Q: Match the stage of gestation with the key developments that Occur during that time. Week 5-6 Week…

A: Gestation is the time period between conception and birth. During this time, the child grows and…