Which mixture of gases is thought to have made up Earth's early atmosphere? A. methane, oxygen, hydrogen, water vapor B. carbon dioxide, nitrogen, oxygen, ozone C. hydrogen, water vapor, ammonia, methane, carbon dioxide D. ozone, water vapor, carbon dioxide, ammonia

Answers

Answer 1
Answer: The answer is D. ozone, water vapor, carbon dioxide, ammonia.

Answer 2
Answer: We really don't know what early earth's atmosphere contained. We can only speculate. Likely, it contained methane at some point, along with other noxious gases from erupting volcanoes.

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The term pseudoscience refers to evidence that _____.A. supports a product claimB. was created by a reliable sourceC. pretends to be scientific, but actually is notD. was gathered during a scientific experiment
The study of which structure was instrumental in the formulation of the modern cell theory? A. plant cell B. animal cell C. cell membrane D. DNA molecule

HELP ASAP PLEASE How does exercise increase oxygen intake by the cells? A) It increases blood flow. B)It increases the release of carbon monoxide through the lungs. C)It increases the production of blood proteins which improves structures of the brain. D)It encourages tissue growth.

Answers

Exercise increase oxygen intake by the cells as it increases blood flow. the correct option is A.

Thus, Exercise improves blood flow, which in turn enhances cellular oxygen uptake. Our heart rates increase and more blood is pushed through the body while we exercise.

The cells receive more oxygen thanks to the increased blood flow, which enables them to fulfill the higher energy demands of physical exercise.

Carbon monoxide does not increase oxygen intake during exercise and instead is a harmful chemical that hinders the body's ability to transfer oxygen.

Thus, Exercise increase oxygen intake by the cells as it increases blood flow. the correct option is A.

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The anwser is A!
Hope it helps

Which of the following can be said about the use of agriculture?A. It stunted the growth of civilization and development.
B. It prohibited the use of machinery.
C. It has included practices that led to pollution of soil and water.

Answers

the one that can be said about the use of agriculture is : It has included practices that led to pollution of soil and waterFor example, the use of pesticides during the agriculture process.The use of pesticides has proven to damage the nutrient level of the soil and increase the toxicity level of water's supply

C. it has included practices that led to pollution of soil and water

What does is mean to say a species is a "threatened" species? select one:a. that species is not in immediate danger of extinction but is likely to be so in the near future.
b. that species was brought to the point of extinction, then miraculously saved through conservation measures.
c. that species is having a portion of its habitat destroyed.
d. that species is in immediate danger of extinction.
e. that species has many natural predators?

Answers

i think its D. thats my opinion tho!

All of the flower mechanisms would help prevent pollination by a foreign species except __________.

Answers

The given question is incomplete. The complete question is:

All of the flower mechanisms would help prevent pollination by a foreign species except __________.

A. A pollen tube grows in the style of its own species.

B. The stigma is sticky mainly to its own species of pollen.

C. The timing of flowering keeps pollinators moving among a limited number of species.

D. Flowers attract a small number of specialized pollinators, and therefore pollen is not spread equally to all available species of flowers.

E. Flowers of different species are the same color and attract similar pollinators.

Answer:

E. Flowers of different species are the same color and attract similar pollinators.

Explanation:

Plants of different species develop various morphological, physiological and behavioral strategies to ensure that the flowers of one species are not pollinated by pollens from any other species. One such structural adaptation is the production of flowers of a different color, size and shape.

These structural distinctions allow specific pollinators to visit the flowers of the particular species only. It ensures pollens from a different plant species do not land on the flowers of some other species. Production of flowers of the same color by different plant species would attract same pollinators and may result in pollination by a foreign species.

What occurs during a decomposition reaction?

Answers

Answer & explanation:

The decomposition reaction occurs when a compound, by spontaneous (if unstable) or non-spontaneous (if stable) action, when chemically defragmented, generates two new products.

For example:

2AB (s)* → 2A (s) + 2B (g)*

*s is for solid and g for gas

This reaction shows a simple compound AB decomposing into two substances A and B.

What often occurs in decomposition reactions is the formation of a gas (g) and its release after the reaction, due to the fact that the compounds are formed by electron(e⁻) affinity, and gases are extremely electronegative.

a compound partitions into it's components.

Which of the following statements is true for a eukaryotic cell?A. Does not possess intracellular membrane bound organelles. Everything inside just floats freely in the cytoplasm.
B. 
Possesses the characteristic of compartmentalization of organelles, wherein the organelles are bound by membranes.
C. 
Possesses simple duplex DNA in the form of a circular loop.

Answers

Possesses the characteristic of compartmentalization of organelles, wherein the organelles are bound by membranes. The correct option is B.

What is eukaryotic cell?

Eukaryota is a varied domain of creatures whose cells have a nucleus, and its members are referred to as eukaryotes.

Eukaryotes include all animals, all plants, all fungi, and many unicellular creatures. They are a part of the Eukaryota or Eukarya group of organisms, one of the three categories of life.

Animals, fungi, plants, and protists all have eukaryotic cells. DNA is typically housed in the nucleus, an organelle that is encircled by a membrane known as the nuclearenvelope.

A nuclear membrane is present in eukaryotic cells. It has a cell wall, mitochondria, and Golgibodies.

It also has cilia and flagella, which are locomotory organs. The DNA in the nucleus contains all of the genetic data.

Thus, the correct option is B.

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B. is the correct answer.