Q: What do vectors possess that scalars do not? Read this paragraph and choose the correct option from the provided answers: In physics, a quantity, such as mass, length, or speed that is completely specified by its magnitude and has no direction is called a scalar . A vector , on the other hand, is a quantity possessing both magnitude and direction. A vector quantity is typically represented by an arrow-tipped line segment. The length of the line, drawn to scale, represents the magnitude of the quantity. The direction of the arrow indicates the direction of the vector. Not only can vectors be represented graphically, but they can also be added graphically. Choices: - height and polarity - direction and texture - magnitude and weight - magnitude and direction A:
magnitude and direction

(Question)
Q: In humans, what period lasts from the ninth week of development until birth? Read this paragraph and choose the correct option from the provided answers: 28.3 Fetal Development The fetal period lasts from the ninth week of development until birth. During this period, male and female gonads differentiate. The fetal circulatory system becomes much more specialized and efficient than its embryonic counterpart. It includes three shuntsthe ductus venosus, the foramen ovale, and the ductus arteriosusthat enable it to bypass the semifunctional liver and pulmonary circuit until after childbirth. The brain continues to grow and its structures differentiate. Facial features develop, the body elongates, and the skeleton ossifies. In the womb, the developing fetus moves, blinks, practices sucking, and circulates amniotic fluid. The fetus grows from an embryo measuring approximately 3.3 cm (1.3 in) and weighing 7 g (0.25 oz) to an infant measuring approximately 51 cm (20 in) and weighing an average of approximately 3.4 kg (7.5 lbs). Embryonic organ structures that were primitive and nonfunctional develop to the point that the newborn can survive in the outside world. Choices: - third trimester - plasma period - development period - fetal period A:
(Answer)
fetal period

Ques: Q: A new species is said to have evolved if separated members of a species evolve genetic differences that prevent what from occurring with the original members?? Read this paragraph and choose the correct option from the provided answers: Assume that some members of a species become geographically separated from the rest of the species. If they remain separated long enough, they may evolve genetic differences. If the differences prevent them from interbreeding with members of the original species, they have evolved into a new species. Speciation that occurs in this way is called allopatric speciation . An example is described in the Figure below . Choices: - extinction - evolution - re-population - interbreeding A:
Ans: interbreeding

(Q).
Q: In a model of an atom, the level with the least energy is the one closest to what? Read this paragraph and choose the correct option from the provided answers: The model of an atom in Figure below has six energy levels. The level with the least energy is the one closest to the nucleus. As you go farther from the nucleus, the levels have more and more energy. Electrons can jump from one energy level to another. If an atom absorbs energy, some of its electrons can jump to a higher energy level. If electrons jump to a lower energy level, the atom emits, or gives off, energy. You can see an animation at this happening at the URL below. Choices: - center - surface - protons - nucleus A:
(A).
nucleus

Ques:Q: What is the term for individuals of a species that live in a particular habitat? Read this paragraph and choose the correct option from the provided answers: CHAPTER SUMMARY 45.1 Population Demography Populations are individuals of a species that live in a particular habitat. Ecologists measure characteristics of populations: size, density, dispersion pattern, age structure, and sex ratio. Life tables are useful to calculate life expectancies of individual population members. Survivorship curves show the number of individuals surviving at each age interval plotted versus time. Choices: - family - ecosystem - biosphere - population A:

Ans:population

Ques:Q: Nitrogen and sulfur oxides form what type of rain? Read this paragraph and choose the correct option from the provided answers: Both nitrogen and sulfur oxides are toxic to humans. These compounds can cause lung diseases or make them worse. Nitrogen and sulfur oxides form acid rain, which is described in the next concept. Choices: - common rain - toxic rain - heavy rain - acid rain A:

Ans:
acid rain