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3 years ago

Which is the first era of Earth’s history?

Biology

2 answers:

sergiy2304 [10]3 years ago

7 0

I believe it’s Precambrian.

Igoryamba3 years ago

7 0

Answer:

Paleozoic era

Explanation:

The first major extinction in Earth's history occurred two to five million years ago, two deadly climaxes over hundreds of thousands of years. Most creatures lived in the seas at this time, so many of the marine creatures of that time, such as trilobites, brachiopods, and graptolites, were destroyed. During this third deadliest extinction, 5 to 5 percent of all species have been extinct.

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Why are alternative scientific theories to evolution not taught in public school?

adoni [48]

Answer:

Option-(D):Alternative scientific theories are suppressed by the science establishment.

Explanation:

Theory of Evolution:

"The theory of evolution states that, there is a process of change which occurs inside the living organism's heritable, physical and behavioral traits over the years or mostly it occurs in a series of generation".

As, there were many other theories that were presented and research was carried out on them in order to increase the level of education regarding the term "evolution".
The alternative theories had no such experimental grounds to prove their worth and authenticity leading them to be suppressed by the Darwin theory of evolution.

3 0

3 years ago

In chloroplasts, when the two photosystems work in series, electrons ejected from the photosystems do not return to them, which

cricket20 [7]

When electrons do not return to the photosystems, it is because of a process known as oxygenic photophosphorylation, a process that is key to photosynthesis.

Photosynthesis is the process by which plants get their energy. This process involves many steps taken in order to turn energy from light, into sugar and molecular energy known as ATP, needed for plants to survive. This process uses a variety of important and complex steps, among which is included oxygenic photophosphorylation.

Oxygenic photophosphorylation is one of the key processes to photosynthesis. It involves the use of photosystems one and three, located in the thylakoid membrane of plant cells, in order to produce NADPH and ATP. These systems enter a state of photoactivation, releasing an electron to be carried by the NADPH molecule towards the Calvin cycle where the electron can be placed onto a carbon atom, for long-term storage, often as a carbohydrate.

To learn more visit:

brainly.com/question/10499200?referrer=searchResults

3 0

2 years ago

Scientists have discovered and identified only a fraction of the species living and extinct. True or False?

insens350 [35]

Science

This is true because humans can only know so much due to unexplored lands, water depth, and evidence of extinction being hidden.

5 0

2 years ago

Read 2 more answers

Type a paragraph summarizing cellular division and differentiation

OLga [1]

Answer:

Cellular differentiation is the process in which a cell changes from one cell type to another. Usually, the cell changes to a more specialized type. ... Differentiation continues in adulthood as adult stem cells divide and create fully differentiated daughter cells during tissue repair and during normal cell turnover.

8 0

2 years ago

Read 2 more answers

The movement of sperm from the seminiferous tubules to the epididymis is the result of?

Genrish500 [490]

Answer:

With sufficient stimulation, mature sperm travel from the epididymis through the vas deferens, a muscular tube, which propels sperm forward ...

Explanation:

6 0

1 year ago