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鈥淟ife has profoundly changed the Earth.鈥 Explain whether or not these experimental results support this statement.

Short Answer

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The findings suggest that early nonvascular plants may have produced enough chemical weathering of rock to lower CO2 levels in the atmosphere. The perfect storm of climate change and biodiversity loss, along with the unpredictable nature of disease emergence, has dramatically altered lives.

Step by step solution

01

Chemical weathering of rock

The molecular structure of rocks and soil is changed by chemical weathering. Carbon dioxide from the air or the soil, for example, can occasionally interact with water in a procedure called carbonation.

02

Non-vascular plants cause weathering of rocks

Mosses, liverworts, and hornworts are non-vascular plants that developed about 450 million years ago during the Ordovician period. Mosses and lichens can degrade the rock they develop on by producing various acids.

03

Effect of non-vascular plants and weathering of rocks on life on Earth

Plant roots grow into rocks and shatter them when they produce mechanical deterioration. Around 800 million years ago, the first complex animals evolved, and they may have taken so much CO2 from the atmosphere that the entire planet froze over in a snowball Earth.

Ice sheets momentarily blanketed much of the earth 35 million years later, resulting in a global extinction. Carbon dioxide levels likely dropped dramatically right before the ice arrived.

Thus, according to the findings, the early nonvascular plants have produced chemical weathering of rocks that lead to a profound change in the life present on Earth.

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Most popular questions from this chapter

The feather moss Pleuroziumschreberiharbors species of symbiotic nitrogen-fixing bacteria. Scientists studying this moss in northern forests found that the percentage of the ground surface 鈥渃overed鈥 by the moss increased from about 5% in forests that burned 35 to 41 years ago to about 70% in forests that burned 170 or more years ago. From mosses growing in these forests, they also obtained the following data on nitrogen fixation:

(a) Use the data to draw a line graph, with age on the x-axis and the nitrogen fixation rate on the y-axis.

(b) Along with the nitrogen added by nitrogen fixation, about 1 kg of nitrogen per hectare per year is deposited into northern forests from the atmosphere as rain and small particles. Evaluate the extent to which Pleurozium affects nitrogen availability in northern forests of different ages.

Based on their experimental results, the researchers added weathering of rock by non-vascular plants to simulation models of the Ordovician climate. The new models predicted decreased CO2 levels and global cooling sufficient to produce the glaciations in the Late Ordovician period. What assumptions did the researchers make in using results from their experiments in climate simulation models?

Identify each of the following structures as haploid or diploid.

(A) sporophyte

(B) spore

(C) gametophyte

(D) zygote

Giant lycophyte trees had microphylls, whereas ferns and seed plants have megaphylls. Write a short essay (100鈥150 words) describing how a forest of lycophyte trees may have differed from a forest of large ferns or seed plants. In your answer, consider how the type of forest may have affected interactions among small plants growing beneath the tall ones.

In plants, which of the following are produced by meiosis?

(A) haploid gametes

(B) diploid gametes

(C) haploid spores

(D) diploid spores

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