Answer the following question given this paragraph: Cynodonts probably gave rise to mammals about 200 million years ago. However, they are not considered to be mammals themselves. In fact, competition with early mammals may have led to their extinction. They went extinct sometime during the Jurassic or Cretaceous Period. Q: Competition with what emerging animal group may have led to extinction of cynodonts about 200 million years ago? Choices: - reptiles - amphibians - insects - mammals A:
mammals
(Question)
Answer the following question given this paragraph: Cleavage and Blastula Stage The development of multi-cellular organisms begins from a single-celled zygote, which undergoes rapid cell division to form the blastula. The rapid, multiple rounds of cell division are termed cleavage. Cleavage is illustrated in (Figure 43.24a). After the cleavage has produced over 100 cells, the embryo is called a blastula. The blastula is usually a spherical layer of cells (the blastoderm) surrounding a fluid-filled or yolk-filled cavity (the blastocoel). Mammals at this stage form a structure called the blastocyst, characterized by an inner cell mass that is distinct from the surrounding blastula, shown in Figure 43.24b. During cleavage, the cells divide without an increase in mass; that is, one large single-celled zygote divides into multiple smaller cells. Each cell within the blastula is called a blastomere. Q: The development of multi-cellular organisms begins from a single-celled zygote, which undergoes rapid cell division to form this? Choices: - gametophyte - multicell - eukaryote - blastula A:
(Answer)
blastula
Ques: Answer the following question given this paragraph: Ecosystem dynamics include more than the flow of energy and recycling of matter. Ecosystems are also dynamic because they change through time. Q: Ecosystem dynamics include more than the flow of energy and recycling of matter. ecosystems are also dynamic because they? Choices: - stay the same - recreate exactly alike - never move - change through time A:
Ans: change through time
(Q).
Answer the following question given this paragraph: The ear canal is a tube that carries sound waves into the ear. The sound waves travel through the air inside the ear canal to the eardrum. Q: What is the term for the tube that carries sound waves into the ear? Choices: - sound canal - flap canal - tone canal - ear canal A:
(A).
ear canal
Ques:Answer the following question given this paragraph: Emphysema is a disease in which the walls of the alveoli break down so less gas can be exchanged by the lungs. The main symptom of emphysema is shortness of breath. The damage to the alveoli is usually caused by smoking and is permanent. Q: What disease associated with smoking involves breakdown of walls of the alveoli, resulting in less gas exchange by the lungs? Choices: - leukemia - cancer - pneumonia - emphysema A:

Ans:emphysema
Ques:Answer the following question given this paragraph: Condensation is the change of state from a gas to a liquid. Q: What is the process of changing something from a gas to a liquid? Choices: - sublimation - combustion - fermentation - condensation A:

Ans:
condensation