Answer the following question given this paragraph: Figure 28.41 All crustaceans go through different larval stages. Shown are (a) the nauplius larval stage of a tadpole shrimp, (b) the cypris larval stage of a barnacle, and (c) the zoea larval stage of a green crab. (credit a: modification of work by USGS; credit b: modification of work by M. Mingorance Rodriguez; credit c: modification of work by B. Kimmel based on original work by Ernst Haeckel). Q: What goes through different larval stages? Choices: - octopuses - plants - sponges - crustaceans A:
crustaceans
Answer the following question given this paragraph: Because the hydroxyl radical has an unpaired electron, it is highly reactive. (This is true of any substance with unpaired electrons, known as a free radical. ) This hydroxyl radical can react with all kinds of biological molecules (DNA, proteins, enzymes, and so on), causing damage to the molecules and disrupting physiological processes. Examples of direct and indirect damage are shown in Figure 21.32. Q: The hydroxyl radical is highly reactive because it has what? Choices: - unpaired neutron - paired proton - paired electron - unpaired electron A:
unpaired electron
Q: Answer the following question given this paragraph: Farsightedness, or hyperopia, is the condition in which distant objects are seen clearly, but nearby objects appear blurry. It occurs when the eyeball is shorter than normal (see Figure below ). This causes images to be focused in a spot that would fall behind the retina (if light could pass through the retina). Hyperopia can be corrected with convex lenses. The lenses focus images farther forward in the eye, so they fall on the retina instead of behind it. Q: What is the condition in which distant objects are seen clearly, but nearby objects appear blurry? Choices: - synthesise , or hyperopia - nearsightedness or hyperopia - gleam , or hyperopia - farsightedness, or hyperopia A:
A: farsightedness, or hyperopia
Question: Answer the following question given this paragraph: Other modifications that reduce weight include the lack of a urinary bladder. Birds possess a cloaca, a structure that allows water to be reabsorbed from waste back into the bloodstream. Uric acid is not expelled as a liquid but is concentrated into urate salts, which are expelled along with fecal matter. In this way, water is not held in the urinary bladder, which would increase body weight. Most bird species only possess one ovary rather than two, further reducing body mass. The air sacs that extend into bones to form pneumatic bones also join with the lungs and function in respiration. Unlike mammalian lungs in which air flows in two directions, as it is breathed in and out, airflow through bird lungs travels in one direction (Figure 29.32). Air sacs allow for this unidirectional airflow, which also creates a cross-current exchange system with the blood. In a cross-current or counter-current system, the air flows in one direction and the blood flows in the opposite direction, creating a very efficient means of gas exchange. Q: Birds possess a cloaca, a structure that allows water to be reabsorbed from waste back into this? Choices: - intestines - skin - eggs - blood stream A:
Answer: blood stream
*Question*
Answer the following question given this paragraph: Diffusion is the movement of molecules from an area of high concentration of the molecules to an area with a lower concentration. The difference in the concentrations of the molecules in the two areas is called the concentration gradient . Diffusion will continue until this gradient has been eliminated. Since diffusion moves materials from an area of higher concentration to the lower, it is described as moving solutes "down the concentration gradient. " The end result of diffusion is an equal concentration, or equilibrium , of molecules on both sides of the membrane. Q: What is the movement of molecules from an area of high concentration of the molecules to an area with a lower concentration? Choices: - absorption - condensation - secretion - diffusion A:
**Answer**
diffusion
(Q).
Answer the following question given this paragraph: Prokaryotic cells grow to a certain size. Then they divide by binary fission. This is a type of asexual reproduction. Q: Prokaryotic cells grow to a certain size and then they divide by which process? Choices: - linear fission - binary fusion - budding - binary fission A:
(A).
binary fission