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djyliett [7]
4 years ago
11

Land plants developed _____ to get the sperm cells to the egg.

Biology
2 answers:
Alik [6]4 years ago
8 0

Answer:

The correct option is the 4. Pollen tube.

Explanation:

When the male gametophyte of seed plants germinates a tubular structure produced which is pollen tube. Pollen tube extension is an important stage in the plant cycle.

They act as duct or tube to move the male gametes from the pollen grain from the stigma in angiosperms to ovules at the end of the pistil or straight through ovule in some of the gymnosperms.

Thus, the correct option is 4. pollen tube

german4 years ago
4 0
Stomata allow for gas exchange on a leaf.

xylem and phloem are tissues that transport water and food throughout the plant.

pollen tubes transport the sperm to the egg.
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Emily (who is 5.5 feet tall) wants to measure the height of a tree in the
serg [7]

Answer:

YES

Explanation:

Here apply the formula for tangent of an angle to find height of the tree

Distance from house to tree is 100 ft = adjacent side

Tan ∅ = opposite side/adjacent side

Tan 46.4° = height of tree/100

h= 100 tan 46.4° = 105.01 ft

Given height of Emily is 5.5 ft, add this to 105.01 to find total height of the tree

=105.01 + 5.5 =110.51 ft

The tree is tall (110.51 ft) enough to hit her home which is 100 ft away from the tree.

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3 years ago
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8 0
3 years ago
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7 0
3 years ago
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Thomas Malthus was an economist who influenced Darwin's developing theory of evolution. Malthus observed that the birthrate amon
sukhopar [10]

Answer:

The work of Thomas Malthus help and influence Darwin Thomas to refine his theory of natural selection by explaining that there is a meaningful competition between the individuals of a particular species or population for a specific resource such as food or shelter.

Thomas Malthus predicted that the human population is reproducing faster than its death race and will lead to growing faster than space and food supplies needed to sustain it. Darwin concluded further that If all offspring of almost any species survived for several generations, they would overrun the world and therefore a healthy and meaningful competition is present and to overcome this natural selection takes place as the individual adapt will ultimately survive.

4 0
3 years ago
Why are the large finches now living on the galápagos islands different from the original source population from a nearby islan
Softa [21]

Answer:

The reasons are explained below -

Explanation:

The large finches living on the Galapagos islands are different from the original source population from a nearby islands because of the following reasons -

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All the above listed reasons are responsible for the difference in the finches found on the two islands.

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