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Nina [5.8K]
3 years ago
7

Radiocarbon dating uses a radioactive isotope of the element _______

Biology
1 answer:
frez [133]3 years ago
6 0

Radiocarbon dating uses a radioactive isotope of the element carbon to determine the ages of old objects.

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A calm pond has ___ energy while a water fall has _____ energy
Sedbober [7]
1.pontential energy       2. kinetic energy
4 0
4 years ago
Read 2 more answers
The cells in this part of a plant form long, vertical tubes. What is the most
3241004551 [841]

Answer:

D. The tubes allow water and nutrients to be transported throughout

the plant.

Explanation:

option D supports the description of the cells. The long , vertical tubes transport water and nutrients and are most likely xylem and phloem vessels.

option A is wrong since, chloroplasts inside the cell helps in absorbing sunlight.

option C is also wrong, because water loss is controlled by the stomata in the leaves and they are not long tubes.

option B could possibly be right but option D is better suited.  

6 0
4 years ago
The organisms that first inhabited the earth are thought to have been:.
Reptile [31]

Answer:

there were only anaerobic heterotrophic bacteria (the primordial atmosphere was virtually oxygen-free).

7 0
2 years ago
What is a function of a bacterium's capsule?
nevsk [136]

The purpose of a bacterium's capsule is protection.

<h3>What use does the capsule of a bacteria serve?</h3>

White blood cells may eat and kill pathogens, but capsules could stop that from happening (phagocytosis). Although the precise mechanism for avoiding phagocytosis is unknown, it may occur because the presence of capsules makes the surface elements of bacteria more slippery, preventing the bacterium from being absorbed by phagocytic cells.

Capsules comprised of bacterial defenses and the host. The main function of the capsules of pathogenic bacteria is to prevent opsonophagocytosis or in the case of Gram-negative bacteria, complement-mediated lysis by shielding the bacterial surface from interactions with the host immune system.

To learn more about bacterium's capsule visit:

brainly.com/question/12789454

#SPJ4

3 0
2 years ago
Why are all four chromatids different?
attashe74 [19]

Answer:

<em>They differ from both parents and also from each other. This occurs through a number of mechanisms, including crossing-over, the independent assortment of chromosomes during anaphase I, and random fertilization. When homologous chromosomes form pairs during prophase I of meiosis I, crossing-over can occur.</em>

Explanation:

<h3>I hope this helps!!</h3>
4 0
2 years ago
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