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Mice21 [21]
2 years ago
6

Fossils of a microscopic organism are found in rocks determined to be over 3.5 billion years old. Identify TWO types of evidence

that would help answer the question of whether the organism was photosynthetic.
Biology
1 answer:
scZoUnD [109]2 years ago
3 0

Answer:

The first organisms that did photosynthesis used hydrogen to carry it out as plants do today, although at that time hydrogen sulfide gas was abundant, that is why it was supposed that they used that hydrogenated source as a requirement for photosynthesis In this way, the presence of gaseous and sulfur structures in these fossils could affirm that they were photosynthetic.

On the other hand, it is believed that the first photosynthetic organisms were not plants per se, but rather prokaryotic organisms. Photosynthetic life begins in water without a doubt and around 400 million years ago, plants conquered the air, at which time they developed a material known as a cuticle and which acts as a waterproof to prevent desiccation, but which in turn prevents gas exchange, which led to the next evolutionary step: the appearance of stomata.

Explanation:

According to Carrión, who was a «later, during the Carboniferous, the first trees and the first forests appear. Only the flower delays its appearance until 140 million years ago (Lower Cretaceous) although it arrives giving rise to plants (angiosperms) that will later have greater evolutionary success, since although the flowers lack greater adaptive advantages, they do allow more development fast from the seeds, which in the face of a catastrophe like the fall of a meteorite is an advantage, since it allows them to recover quickly ”.

Thus, "the great invention of angiosperms is the appearance of very rapid fertilization and the rapid formation of a seed, through a process of evolutionary alteration of embryonic development that is known as progenesis and leads to the passing of a individual with a late sexual development to another in which sexual maturation occurs much faster ”, Carrión details.

In short, a process of acceleration of embryonic development as a simple consequence of a mutation in a regulatory gene, and an organism competitively much higher from the ecological point of view emerges, capable of replacing a gymnosperm from its ecological niche. Not surprisingly, in the words of the UMU Professor, "the places where plants grow best today are places like the tropics, with lots of light and lots of water and where angiosperms predominate."...

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_______ a complex of DNA and Protein housed in the nucleus of the cell.
murzikaleks [220]

Answer:

chromatin

Explanation:

5 0
3 years ago
What happens to salinity if the rate of evaporation is greater than precipitation? Why?​
malfutka [58]

Answer:

Answer:

Explanation:

What happens when water's salinity increases?

A combination of high salinity and low temperature makes seawater so dense that it sinks to the bottom of the ocean and flows across ocean basins as deep, slow currents.

What happens to local salinity when evaporation rates increase?

Salinity is the saltiness of seawater. Salinity is measured by the concentration of grams of salt per kilogram of water. ... What happens to local salinity when evaporation rates increase: Rises 5.

How is salinity related to evaporation and precipitation?

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*Hope this answered your question?*

8 0
3 years ago
Genotypes usually involve some combination of dominant and recessive alleles. What is the most common inheritance pattern?​
mylen [45]

Answer:

The correct answer is option D) six dominant and two recessive.

Explanation:

The most common genetic inheritance pattern involves cross between heterozygous recessive parents which means it has one allele of each character in every parent (suppose Tt).

Cross between these parents provide these offspring; TT, Tt, Tt, and tt which exhibit 3:1 ration which can also be mention as 6:2 which means 6 out of the 8 has dominant (homozygous or heterozygous) and 2 out of 8 offsprings are recessive alleles.

Thus, the correct answer is option D) six dominant and two recessive.

4 0
3 years ago
A researcher claims that the Makira Island and the Santa Ana Island flycatchers are diverging into different species. Identify T
natali 33 [55]

Answer:

Prezygotic barriers:

1. Habitat isolation

2. Behavioral isolation

Explanation:

Pre-zygotic barriers are the barriers which do not allow the formation of the zygote in the organisms.

The two mechanisms of the pre-zygotic barriers are the:

1. Habitat isolation: the Flycatchers do not share the same habitat which is also mentioned in the question that they live on different islands.

2. The behavioural isolation: the Flycatchers could have evolved the different mating rituals as a result of which the could not interbreed.

Thus, Habitat isolation and Behavioral isolation are correct.

8 0
3 years ago
Whales are thought to have evolved from land animals similar to large otters. as evidence of this, whales have useless leg bones
Viktor [21]
It is a vestigial structure
6 0
2 years ago
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