Answer the following question given this paragraph: New species arise in the process of speciation. Allopatric speciation occurs when some members of a species become geographically separated. They then evolve genetic differences. If the differences prevent them from interbreeding with the original species, a new species has evolved. Sympatric speciation occurs without geographic separation. Q: What occurs when some members of a species become geographically separated? Choices: - divergent speciation - symbiotic speciation - reflective speciation - allopatric speciation A:
allopatric speciation
Answer the following question given this paragraph: Reptiles are a class of tetrapod vertebrates that produce amniotic eggs. They include crocodiles, alligators, lizards, snakes, and turtles. The reptile class is one of the largest classes of vertebrates. It consists of all amniotes except birds and mammals. Q: What are a class of tetrapod vertebrates that produce amniotic eggs called? Choices: - mammals - amphibians - insects - reptiles A:
reptiles
Q: Answer the following question given this paragraph: At the poles, the Sun's rays are least direct. Much of the area is covered with ice and snow, which reflect a lot of sunlight. Temperatures are lowest here. Q: Where are temperatures the lowest? Choices: - over the oceans - at the equator - in asia - at the poles A:
A: at the poles
Question: Answer the following question given this paragraph: During the diakinesis stage, chromosomes further condense. The chiasmata remain intact during this stage. The remainder of this stage is similar to prometaphase of mitosis: the nucleoli disappear, the nuclear membrane disintegrates, and the meiotic spindle begins to form. Q: Chromosomes further condensed in which stage? Choices: - tracheophyte stage - zooflagellate stage - zygum stage - diakinesis stage A:
Answer: diakinesis stage
*Question*
Answer the following question given this paragraph: Introduction Plants have evolved different reproductive strategies for the continuation of their species. Some plants reproduce sexually, and others asexually, in contrast to animal species, which rely almost exclusively on sexual reproduction. Plant sexual reproduction usually depends on pollinating agents, while asexual reproduction is independent of these agents. Flowers are often the showiest or most strongly scented part of plants. With their bright colors, fragrances, and interesting shapes and sizes, flowers attract insects, birds, and animals to serve their pollination needs. Other plants pollinate via wind or water; still others self-pollinate. Q: Unlike plants, animal species rely almost exclusively on what type of reproduction? Choices: - pollination - multiplication - regeneration - sexual reproduction A:
**Answer**
sexual reproduction
*Question*
Answer the following question given this paragraph: A drug known as RhoGAM, short for Rh immune globulin, can temporarily prevent the development of Rh antibodies in the Rh mother, thereby averting this potentially serious disease for the fetus. RhoGAM antibodies destroy any fetal Rh+ erythrocytes that may cross the placental barrier. RhoGAM is normally administered to Rh mothers during weeks 2628 of pregnancy and within 72 hours following birth. It has proven remarkably effective in decreasing the incidence of HDN. Earlier we noted that the incidence of HDN in an Rh+ subsequent pregnancy to an Rh mother is about 1314 percent without preventive treatment. Since the introduction of RhoGAM in 1968, the incidence has dropped to about 0.1 percent in the United States. Q: Rh antibodies can prove dangerous if they cross what barrier in pregnancy? Choices: - stomach - fungal - embryo - placental A:
**Answer**
placental