This was Lamarck's idea. Here's an example: Suppose giraffes originally had short necks that they stretched to reach high-up leaves in the trees. This continuous stretching of the neck was passed onto offspring, who as a result had slightly longer necks. This continued for multiple generations until we get today's long-necked giraffe. Lamarck was on to something (that something being evolution by natural selection, which Darwin discovered), but his theory wasn't completely correct since organisms can only pass on genes (segments of DNA that code for a characteristic or function) to their offspring. Since "stretching" would not code into DNA, it wouldn't be passed onto offspring, proving Lamarck's theory incorrect.
As students observe several slides of tissue cross-sections, one simple key they can use to determine if the slides come from dicots or monocots is to analyze the <em><u>vascular bundles</u></em><em><u>.</u></em>
A vascular bundle is described as a portion of the transport system of vascular plants. These bundles are microscopically different in Monocots than they are in Dicots, which will allow students to tell them apart through the tissue slides.
The difference is that monocots contain <em><u>randomly scattered </u></em><em><u>bundles </u></em><em><u>located throughout the </u></em><em><u>stem</u></em><em><u>.</u></em> On the other hand, <u>dicots </u><em><u>have their vascular </u></em><em><u>bundles </u></em><em><u>more neatly organized in </u></em><em><u>concentric circles</u></em><em><u>.</u></em> These microscopic differences can serve as a key to be used by the students to classify the tissue samples they are studying.
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Answer:
c. the ventricles are relaxed and fill with blood is correct
Explanation:
Vertebrata
Vertebrata is a group that contains various organisms which possess vertebrae (backbones). Animals that belong to the group are called vertebrates, and they include mammals, birds, fish, amphibians, and reptiles. The backbones in the animals extends from the head to the tail, and it encloses and protects the main nerve cord. The body of vertebrates is divided into trunk, and tail regions. They also possess a unique tube shaped brain, a distinct head, and three pairs of sense organs.