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WARRIOR [948]
3 years ago
10

What is thought to have caused the mass extinction at the end of the Cretaceous Period? A) global warming Eliminate B) an astero

id hitting Earth in Mexico C) extensive volcanic activity world-wide D) the start of glaciation and climatic changes
Biology
2 answers:
GalinKa [24]3 years ago
5 0

The answer is B. Geology has shown a thin layer of iridium (a rare mineral on earth but found on asteroids and meteors) in the rock layers between the Cretaceous and Paleogene periods. Below this layer are numerous fossils of  pterosaurs and dinosaurs, but above the layer are drastically few. The aftermath of asteroid impact is believed to have smothered most vegetation from earth which dinosaurs depended on as a source of food.  






kifflom [539]3 years ago
5 0

Answer:

B

Explanation:

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What advantage does the switch to sexual reproduction give the aphids?
romanna [79]
)Sexual reproduction maintains a constant level of variation in the population and requires less energy.
6 0
3 years ago
Jessie was conditioned to blink using an air puff and a tone. the experimenter then presented only the tone until the blink resp
kondor19780726 [428]

This is referred to as: spontaneous recovery

Spontaneous recovery is a theory of learning and memory which involves unexpected and recurrence of a conditioned response after a period of reduced response or delay. Spontaneous recovery is associated with classical conditioning and operant conditioning. Extinction will happen quickly after a spontaneous recovery, if the conditioned and unconditioned stimulus is not connected.


6 0
3 years ago
3. What body movements are due to muscles working in opposed<br> groups? Explain
NikAS [45]

Answer:

Elbow

Explanation:

Muscle works in pairs and groups e.g biceps flexes the elbow and triceps extend it and it is called antagonistic muscle action.

The working muscle is called the primer mover or agonist. The relaxing muscle by another muscle is called synergists.

When muscles cause a limb to move through the joint range of motion,it could be synergists or antagonists.

I hope this will help you

6 0
3 years ago
What kind of solution causes chloroplasts to be pushed outward against the cell wall, isotonic, hypertonic, or hypotonic?
Elina [12.6K]
The answer to this question would be hypertonic.

If the chloroplast is going to be pushed against the cell wall, probably the water around the cell wall is decreased, causing it to suck up the water inside. Then, the solution must be causing the cell to lose water. The cell will lose water if put in a hypertonic solution. In a hypertonic solution, the osmotic pressure of the solution is higher than the cell, make it attract water from cells.
7 0
3 years ago
Which of the following statements best describes a benefit of sexual reproduction?
Ivan

Among the listed options, we can conclude that option C which states that "<em>It results in the </em><em>diversity </em><em>of the </em><em>species</em><em> that enhances the probability of </em><em>survival</em><em>.</em>" is correct.

Sexual reproduction offers organisms an advantage over those who undergo Asexual reproduction. Though there are benefits and drawbacks to each method, Sexual reproduction is a method that is <u>better adapted to a changing environment and promotes the faster </u><u>evolution </u><u>of a </u><u>species</u><u>.</u>

The main benefit of sexual reproduction is that it allows for a<u> </u><u>greater diversity </u><u>of the </u><u>species</u><u> which enhances the probability of </u><u>survival</u><u>.</u> This is due to the fact that sexual reproduction leads to varying combinations of alleles for specific traits, which coupled with selective reproduction (<em>the ability of a member of the species to choose a spouse with desirable traits</em>) <u>leads to </u><u>offspring </u><u>who over time are increasingly better </u><u>adapted </u><u>to life in the given </u><u>environment</u><u>, with specific traits tailored for </u><u>survival</u><u>.</u>

To learn more visit:

brainly.com/question/2983646?referrer=searchResults

7 0
2 years ago
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