Answer the following question given this paragraph: Placenta of a Placental Mammal (Human). The placenta allows the exchange of gases, nutrients, and other substances between the fetus and mother. Q: What mammalian structure allows the exchange of gases, nutrients, and other substances between the fetus and mother? Choices: - uterus - mitochondria - notochord - placenta A:
placenta
(Question)
Answer the following question given this paragraph: After implantation occurs, the blastocyst is called an embryo . The embryonic stage lasts through the eighth week following fertilization. During this time, the embryo grows in size and becomes more complex. It develops specialized cells and tissues and starts to form most organs. For an interactive animation of embryonic development, go to this link: http://health. howstuffworks. com/adam-200129. htm . Q: What is the blastocyst called after implantation? Choices: - trophoblast - an nucleus - an produce - an embryo A:
(Answer)
an embryo
Ques: Answer the following question given this paragraph: in which C is a constant that depends on the type of crystal structure; Z+ and Z are the charges on the ions; and Ro is the interionic distance (the sum of the radii of the positive and negative ions). Thus, the lattice energy of an ionic crystal increases rapidly as the charges of the ions increase and the sizes of the ions decrease. When all other parameters are kept constant, doubling the charge of both the cation and anion quadruples the lattice energy. For example, the lattice energy of LiF (Z+ and Z = 1) is 1023 kJ/mol, whereas that of MgO (Z+ and Z = 2) is 3900 kJ/ mol (Ro is nearly the sameabout 200 pm for both compounds). Different interatomic distances produce different lattice energies. For example, we can compare the lattice energy of MgF2 (2957 kJ/mol) to that of MgI2 (2327 kJ/mol) to observe the effect on lattice energy of the smaller ionic size of F as compared to I. Q: Different interatomic distances produce different lattice what? Choices: - qualities - surfaces - weights - energies A:
Ans: energies
(Q).
Answer the following question given this paragraph: General Cnidarian Life Cycle. Cnidarians may reproduce both asexually and sexually. Q: What are two ways cnidarians are able to reproduce? Choices: - mitosis and meiosis - spawning and sexual - internally and externally - asexually and sexually A:
(A).
asexually and sexually
Ques:Answer the following question given this paragraph: An electromagnetic wave begins when an electrically charged particle vibrates. The Figure below shows how this happens. A vibrating charged particle causes the electric field surrounding it to vibrate as well. A vibrating electric field, in turn, creates a vibrating magnetic field. The two types of vibrating fields combine to create an electromagnetic wave. You can see animations of electromagnetic waves at these URLs:. Q: Electromagnetic waves are generally caused by magnetic fields doing what (or moving in what way)? Choices: - revolving - rippling - folding - vibrating A:

Ans:vibrating
Answer the following question given this paragraph: The Prokaryotic Cell Recall that prokaryotes (Figure 22.10) are unicellular organisms that lack organelles or other internal membrane-bound structures. Therefore, they do not have a nucleus but instead generally have a single chromosomea piece of circular, double-stranded DNA located in an area of the cell called the nucleoid. Most prokaryotes have a cell wall outside the plasma membrane. Q: Prokaryotic cells do not have a nucleus but instead generally have a single chromosome, a piece of double-stranded dna located in an area of the cell called the what? Choices: - lysosome - cytoplasm - spicule - nucleoid A:
nucleoid