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il63 [147K]
3 years ago
14

3. Gases pass in and out of a leaf through the

Biology
1 answer:
iVinArrow [24]3 years ago
3 0

Answer:

a) stomata

Explanation:

The stomata are little pores / doorways / openings that have the express purpose of allowing gases in and out. Without this, plants would not be able to fix carbon, which is essential in respiration.

Why not c or b: The xylem and phloem channel water through the plant, not gases.

Why not d: The cuticle is the waxy outer layer of the leaf meant to protect it, not allow gases through.

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What is the basis for the delay between the atrial and ventricular contractions in a normal heart?
earnstyle [38]

The main responsible for the delay among the atrial and ventricular contractions is the action potential conduction velocity of the AV node cells. If the atria and ventricles contract simultaneously, atria cannot give any help in filling the ventricles, which is needed, especially in those with stiff ventricles as in the elderly. Hence atria have to contract first and then the ventricles.

5 0
3 years ago
Pollen can be used as an indicator of past climates and vegetation. give two reasons why pollen is well suited to this use:
almond37 [142]

Answer:

A.) Pollen are well preserved in the sediment layers because they are highly resistant to decay.

B.) Other indicators that can be used to determine past climates are through the analysis of the width of tree rings and the coral reefs formed underwater.

7 0
3 years ago
Which is an example of an insertion mutation that changes all of the amino acids that follow the mutation?
astra-53 [7]

Answer:


2) CAG - TTC - ACG mutates to CAG - TTC - ACC - ACG

Explanation:

Insertions are mutations in which extra base pairs are inserted into a new place in the DNA. The number of base pairs inserted can range from one to thousands!

In option no. 1: We see that there is not addition of a single or more than one base, but the new base sequence is different from the original sequence at three places i.e: TTA - CAC - G

In option no. 2: The insertion of three bases ACC has been made exactly after TTC, the whole sequence and arrangement of bases remain same except this insertion.


In option no. 3: The first base of the sequence T is replaced with A, and all other sequence is same. This type of mutation is called substitution in which one base is replaced by other.


In option no. 4: The last base of the sequence C is deleted, and is not present in new sequence. This type of mutation is called deletion in which a base is removed from the sequence.


Conclusion: Therefore, the best option is 2, in which whole codon is inserted in the DNA base sequence.



7 0
2 years ago
Read 2 more answers
Which of the following are sessile echinoderms?
gavmur [86]

<span>your answer ..is sea lilies </span>

8 0
3 years ago
PLEASE HELP ME OUT!!! IVE BEEN STUCK ON THIS QUESTION FOR AN HOUR.
Alenkasestr [34]

Answer:

2, 1, 4, 6, 7, 6, 8, 3

Explanation:

3 0
3 years ago
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