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faltersainse [42]

3 years ago

7

What did the earliest vascular plants lack?

2 answers:

Tanya [424]3 years ago

7 0

The answe is b i think

arlik [135]3 years ago

5 0

Answer:

What did the earliest vascular plants lack?

D. All of the above.

Explanation:

The earliest vascular plants were incapable of making both fruits and flowers, they also had stems which connected them to the ground instead of roots.

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if the blood flow to the brain ceases for 5 to 10 seconds, the muscles will start to twitch convulsively whithin how long?

Tanya [424]

<span>Is 15-20 seconds that is</span>

4 0

3 years ago

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You measure the pH of your backyard soil and find it is 7. You measure the pH of your friend's backyard soil and find it is 4. H

olchik [2.2K]

Answer:

1000 times.

Explanation:

Hello,

In this case, since the pH is defined by:

$pH=-log([H^+])$

If we want to compute the concentration of hydrogen we must write:

$[H^+]=10^{-pH}$

Thus, for both the backyard soils we compute:

$[H^+]_{pH=7}=10^{-7}=1x10^{-7}M$

$[H^+]_{pH=4}=10^{-4}=1x10^{-4}M$

It means that:

$\frac{[H^+]_{pH=4}}{[H^+]_{pH=7}} =\frac{1x10^{-4}M}{1x10^{-7}M}\\ \\\frac{[H^+]_{pH=4}}{[H^+]_{pH=7}}=1000$

It means that the concentration of hydrogen at a pH of 4 is 1000 times greater than the concentration of hydrogen at a pH of 7.

Regards.

4 0

3 years ago

ololo11 [35]

Chromosomes is the answer I think

3 0

2 years ago

The type of learning that occurs when a stimulus produces a particular response because it’s associated with a positive or negat

Alik [6]

Science subject in school

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3 years ago

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What anatomy is the study of similarities and differences in organisms structures

natali 33 [55]

Answer:

Comparative anatomy.

Explanation:

Comparative anatomy is a branch of science in which we study about similarities and differences present in different organisms. This type of study is very important for the classification of living organisms. Comparative anatomy tells us about the evolution of an organism. Scientists study DNA, embronic structure and the internal structure of species to see the evolution of different organisms.

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3 years ago