The top, exposed layer a has undergone

A large number species on Earth become extinct during a short time period about 65 million years ago. Based on this pattern of e

max2010maxim [7]

Answer and Explanation:

During the whole biota history, there occurred extinctions due to different reasons.

During the Cretaceous, which took place between 145-65 million years ago, there occurred a massive extinction that eliminated most of the species on the Earth. Many of the characteristic groups of this period were affected. Dinosaurs, Plesiosaurs, Ammonites, Tricodonts, Cycas, Gynkgos, Conifers, the recent angiosperms, birds, and mammals.

The extinction was caused by the volcanic eruptions, and the unusual fall of many different asteroids, which caused important changes on the Earth´s surface. The consequent climatic change was what ended affecting all the species directly. The extinction was gradual, although it occurred in a short geological lapse of time.

4 0

3 years ago

SOMEONE PLEASR HELP ME I SUCK AT DENSITY do both if possible :)

makvit [3.9K]

Answer:

1. C

2. B

If I'm wrong sorry but overall I think those are the right answers.

6 0

2 years ago

Which of the following chromosome pairings would a normal female duck have?

ValentinkaMS [17]

Answer: ZW

The sex chromosomes in birds are known as Z and W, and the presence of a W chromosome causes the development of a female <u>(ZW).</u>

Explanation: ducks are cute tho lol

8 0

3 years ago

Read 2 more answers

You learn that a Mars lander has retrieved a bacterial sample from the polar ice caps. You obtain a sample of these bacteria and

Misha Larkins [42]

Answer:

a. conservative replication

b. semi conservative replication

c. dispersive replication

d. discontinuous replication

e. continuous replication

The CORRECT ANSWER IS C.

c. dispersive replication

Explanation:

The attached image shows a single band that becomes lighter (in volume) and increase in darker intensity (in times of color) is revealed with consecutive replications. The major pattern that would produce these outcome is dispersive replication.

Conservative replication do reveal two bands (a 14N for the wholly latest molecule, and a 15N for the totally antiquated molecule) after the initial replication. Therefore, this wholly wrong.

Semi-conservative replication reveal an individual band of transitional weight after the initial replication, followed by two bands following the second replication (one of transitional weight, and the other at the 14N position). These two bands is observed in each following replication, with the transitional weight becoming lighter in color as the 14N band is seen to appear darker in color.

The real pattern gives an individual band that pinpoints to all molecules in an individual replicative cycle possessing the same constituents.

Dispersive replication, has its molecules to be a blend of old (15N) and new (14N) strands. Each replication raises the ratio of new to old strands as it explains the reason an individual band is shown raised (lighter in weight) with every replication.

4 0

3 years ago

A mother brings a 15-month-old child to the well-baby clinic. she states the child has been taking approximately 18 to 20 oz (54

svet-max [94.6K]

A 15-month-old child, equivalent to a child of 1 year and 3 months of age, should have began weaning from bottle feeding from 6 months of age. Tooth decay or dental caries are commonly associated with prolonged bottle feeding as the sugars and other substances in milk; when drank from a teat from a bottle; prolongs the exposure of teeth to the milk, leading to overgrowth of bacteria causing dental caries.

3 0

3 years ago