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lara31 [8.8K]
3 years ago
15

Which of the following is the flattened portion of a leaf? petiole blade vein

Biology
1 answer:
Pavel [41]3 years ago
6 0
The blade is the flattened portion of the leaf. These expanded blades are called lamina which are attached to the plant stem by the petiole. They come in diverse shapes, sizes, and other characteristics. The other choices are just supporting structures of this structure of the plant. 
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What major structure brings oxygen and nutrients to the cells and carries away waste?
liubo4ka [24]
<span>The major structure that supplies the cells with nutrients and removes their waste is the circulatory system. The circulatory system is composed of the heart, the blood vessels going from and back to the heart, and the blood that travels inside them. The blood vessels that carry nutrient and oxygen-rich blood to the cells are arteries. They become the thinner arterioles, and then the thinnest capillaries. With the exception of the pulmonary arteries, which carry non-oxygenated blood from the heart to the lungs, all arteries carry oxygenated blood. The capillaries disburse the nutrients and oxygen to the cells and pick up wastes and carbon dioxide, form into the thicker venules, then to form veins, which lead back to the heart (with the exception of the pulmonary veins, which carry oxygenated blood from the lungs to the heart). Veins also differ from arteries in that veins have valves to prevent blood from flowing backward.</span>
6 0
3 years ago
For ingested foods, the first opportunity for enzymatic digestion occurs in the _____. see concept 41.3 (page 903)
yKpoI14uk [10]

Answer;

The mouth


For ingested foods, the first opportunity for enzymatic digestion occurs in the mouth.


Explanation;

The digestion of food starts in the mouth.

There is both mechanical and enzymatic digestion of food in the mouth. Mechanical digestion involves the mechanical break down of food using teeth to smaller particles thus increasing the surface are for the activity by enzymes.

Enzymatic digestion in the mouth involves enzyme salivary amylase which acts on starch to form maltose.

3 0
3 years ago
A colorimeter is an instrument used for chemical analysis by comparing a liquid’s color with standard colors. In an experiment,
konstantin123 [22]

Answer:

The correct statements are that the first calorimeter is reliable but not valid, and the second calorimeter is valid and reliable.

Explanation:

The first calorimeter is reliable as the reading demonstrated by it is similar when each time the experiment is performed, however, the result attained is not correct, though it is reliable. On the other hand, the second calorimeter is both reliable and valid, as it is demonstrating the accurate results from time to time. This is valid as it is providing a similar result as that of the original readings.

8 0
3 years ago
Which level of classification defines one specific organism?
alukav5142 [94]
The most specific classification of organism is D species. it is considered the basic unit of biological classification or a taxonomic rank. It might bee also define as the largest group of organisms . there could be found classical forms, fixed species and species that could change. 
6 0
3 years ago
Read 2 more answers
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Aloiza [94]

two identical daughter cells

7 0
2 years ago
Read 2 more answers
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