BIOLOGY HIGH SCHOOL

Which process do scientists think provided earth with an oxygen-rich atmosphere?A. spontaneous generation

B. radiometric dating

C. photosynthesis

D. respiration

Answers

Answer 1
Answer:

Photosynthesis provided the Earth with an oxygen-rich atmosphere.

Does Earth have an oxygen-rich atmosphere?

Earth's surface environments are highlyoxygenated from the atmosphere to the deepest reaches of the oceans, representing a hallmark of an active photosynthetic biosphere. However, the fundamental timescale of the oxygen-rich atmosphere on Earth remains uncertain, particularly for the distant future.

What provides the most oxygen on Earth?

Scientists estimate that 50-80% of the oxygenproduction on Earth comes from the ocean. The majority of this production is from oceanic plankton drifting plants, algae, and some bacteria that can photosynthesize

Learn more about photosynthesis here brainly.com/question/3529377

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Answer 2
Answer: C.photosynthesis would be the correct answer

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Small intestine is to nutrient absorption as blood is to nutrient

Answers

Small intestine is to nutrient absorption as blood is to nutrient distribution.Blood has several functions. One of the major functions is to transport nutrients to every cell in the body. Other functions include:1. Respiration- delivers oxygen to the cells and removes carbon dioxide from them.2. Waste removal - disposes of waste products and toxic materials which would otherwise harm the body if allowed to accumulate.3. Immunity- helps protect the body from disease.4. Cellular communication- transports hormones from glands to the target cells and organs.5. Thermoregulation- blood serves to both warm and cool the body as it circulates.

Which type of bacteria causes tetanus?

Answers

The type of bacteria that causes tenus is the Clostridium tetani.

Which of the following is an example of radiation?A. A metal spoon becomes warm after being set in a pot of boiling water.

B. Warm water rises because it is less dense than cool water.

C. Pancake batter cooks quickly after being spooned onto a hot griddle.

D. Our atmosphere is constantly being heated by the sun.

Answers

Answer: D. Our atmosphere is constantly being heated by the sun.

Radiation is the transmission of energy in the form of waves or particles released by one source and absorbed by another source. Types of radiations includes electromagnetic radiation, particle radiation, acoustic radiations and gravitational radiations.

Our atmosphere is constantly being heated by the sun is the example of the radiation because the sun radiates energy in all directions in the form of heat, light and radiations. Solar energy in the form of radiation is either reflected back to the sun or it is absorbed by the earth atmosphere. Therefore, this causes heating up of the earth atmosphere.  
D. Our atmosphere is constantly being heated by the sun is an example of radiation.
A has to do with convection, B with density difference, C with conduction.
Radiation is a great problem because it is constantly destroying our ozone layer which protects us from Sun beams. 

Blood cells are produced in which system?a. circulatory system
b. immune system
c. skeletal system
d. endocrine system

Answers


Correct answer is c  - Blood cell are produced in the skeletal system.

Red blood cells are produced on a regular basis in the bone marrow. Bone marrow is a red spongy material found within the cavities of many of the large bones of the body.

Red blood cell start as immature cell in the bone marrow and after about seven days of maturation, they are released into the bloodstream, that is, the circulatory system where they circulate for about 120 days before being replaced with new ones.
yes the correct answere is c skeletal system

Mitosis results inA)
two unique daughter cells.
B)
four unique daughter cells.
C)
two identical daughter cells.
D)
four identical daughter cells.

Answers

C two identical daughter cells.

Answer:

two identical daughter cells

Explanation:

How is the Maunder minimum related to climate? A. Unusually low sunspot activity correlates to unusually cold climatic events. B. The Maunder minimum is unrelated to climate. C. Changes in the Earth’s tilt correlate to changes in climate. D. Changes in the Earth’s orbit correlate to changes in climate.

Answers

I think the correct answer is D. The Maunder minimum is related to climate because it correlates to unusually cold climatic events. This is an event that happened sterting in 1645 to 1715 where very few sunspots were observed. It is also known as prolonged sunspot minimum. During this event, Europe and North America experienced colder temperature than what was usual.

How is the Maunder minimum related to climate?

    Unusually low sunspot activity correlates to unusually cold climatic events.

Hope I was helpful! (:

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