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3 years ago

Which action is a reflex action?

Biology

2 answers:

san4es73 [151]3 years ago

8 0

Answer:

B. Blinking when lights flashed in eyes

Explanation:

This is a reflex action because blinking when there is light in your eyes is a reflex to protect your eyes.

jek_recluse [69]3 years ago

7 0

B because eyes is a sense organ.

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If a crystal of potassium permanganate is placed on agar and after 15 minutes the diameter of the area over which the dye has sp

Vadim26 [7]

Answer:

Diffusion rate is 1.96 × $10^{-3}$ $cm^{2}$ /s

Explanation:

Diffusion is the process in which the molecules of a substance propagates from a region of higher concentration to region of lower concentration through a semi-permeable membrane.

diffusion rate = $\frac{area}{time}$

Given that; diameter = 15 mm, time = 15 minutes.

The dye spread in a circular form, so that;

area = $\pi$ $r^{2}$

r = $\frac{diameter}{2}$ = $\frac{15}{2}$ = 7.5 mm = 0.75 cm

area = $\frac{22}{7}$ × $(0.75)^{2}$ = 1.7679 $cm^{2}$

time = 15 minutes = 15 × 60 = 900 seconds

So that;

diffusion rate = $\frac{1.7679}{900}$

= 0.0019643 $cm^{2}$ /s

Diffusion rate is 1.96 × $10^{-3}$ $cm^{2}$ /s

7 0

3 years ago

As this bee dines on nectar, it also transfers pollen from one flower to another. Pollen containing sperm is transferred to the

Bumek [7]

I'm so sorry but, I don't know that question well I do but I don't know how to word it. sorry buddy!!

8 0

2 years ago

Which statement is true about climate change and biodiversity?

LenKa [72]

The correct option is C.

Climate is a very important factors in the lives of all living organisms, because it is one of the major factors that determine if a living organism is going to survive or not. Climate change is said to occur when there are changes in the earth's climate system, which result in formation of new weather patterns that last for a long time.

Climate change affect living organisms in different ways; while climate change is beneficial to some organisms, it is detrimental to some. For instance, in Europe climate change (increase in temperature) has been found to have positive effects on some birds populations.

5 0

2 years ago

Read 2 more answers

The order of elements in the periodic table is based on the atomic number.

Elza [17]

The answer is True because if you look at a periodic table it is arranged in the atomic numbers

7 0

3 years ago

Read 2 more answers

Maximum oxygen uptake, or V02max, is the point at which the rate of oxygen consumption reaches a platesu despite an increased wo

Anuta_ua [19.1K]

Answer:

A. Results in higher vo2 max.

1. training for the marathon

2. weight training.

B. Results in lower vo2 max

1. lactic acid accumulation.

2. getting older

3. sedentary lifestyle

4. being female.

C. Neither.

1. being male

2. central fatigue

Explanation:

VO2 max is the measurement of the maximum oxygen consumption during continuously increasing exercise. Higher VO2 means the body is consuming a higher level of oxygen and delivering to muscles without muscle loss on this basis we can sort the following scenarios

A. Results in higher vo2 max.

1. training for the marathon (more oxygen consumption)

2. weight training. (more oxygen consumption)

B. Results in lower vo2 max

1. lactic acid accumulation.

2. getting older (less oxygen consumption and less oxygen delivery to muscles)

3. sedentary lifestyle (less oxygen consumption and less oxygen delivery to muscles)

4. being female.

C. Neither.

1. being male

2. central fatigue

8 0

3 years ago