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snow_tiger [21]
2 years ago
10

Why are pollen grains useful when studying the climate history of a region?

Biology
2 answers:
Alexeev081 [22]2 years ago
4 0
They can be preserved within the fossils of organisms that carry them. They provide clues about the types of plants that grew in a region at a particular time.
iren2701 [21]2 years ago
4 0

Answer: D on edge

Explanation:

They provide clues about the types of plants that grew in a region at a particular time.

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The nucleus of a cell has number of long thread-like structures Called: a. Chromatudes b. centromere c. nucleus d. chrimosomes​
m_a_m_a [10]

Answer:

The answer is D hope this helps!

3 0
3 years ago
What benefits do plants with a smooth stem have? Does the stem type protect a plant?
gogolik [260]
<h3><u>Benefits of smooth stem  over rough stem:</u></h3>

Smooth stem plants like guava, eucalyptus etc do have a smooth layer of bark over its stem that comes out as a skin when they shed their barks. Whereas most of the other plants like mango, banyan etc do have a rough corrugated layer of bark over their stem.

The smooth stem doesn’t let water to accumulate in the bark which can led to infections to the tree. It also doesn’t allow any seed to settle on bark that can led to growth of parasites. Thereby this smooth bark saves the trees from some of the probable harm to the tree.  

7 0
2 years ago
What could be one possible effect on human health due to an oil spill?
mojhsa [17]

Answer: C. Oil from the oil spill could enter aquatic organisms, like fish, which could make people sick.

Explanation:

Oil spill in water body can be caused by the industrial oil discharge, emission of vehicle oil in water body.

The oil may contain toxic chemicals which could be consumed by the fishes or other aquatic organisms. The fishes and other edible aquatic organisms if consumed by human beings can make people unhealthy or sick.

7 0
3 years ago
Read 2 more answers
What element increases after giving blood?
DaniilM [7]
<span>Reticulocytes are immature red blood cells. Red blood cells that haven't fully developed, yet. When our bodies lose a large amount of blood, we rapidly produce reticulocytes, so that our bodies can quickly replenish their red blood supplies. And obviously, when we donate blood, we lose blood.</span>

6 0
3 years ago
Read 2 more answers
QUESTION 1
nata0808 [166]

Answer:

According to the sliding-filament model of contraction, the muscle contraction occur due to the myosin heads propel the actin myofilaments toward the center of the sarcomere. This pulls the Z disks closer together, shortening  sarcomere and the entire muscle

Explanation:

In the muscle fiber there are two proteins that facilitate the process of contraction, myosin and actin. Myosin is thicker and more abundant than actin, and its interaction is responsible for the process of muscle contraction.

Both molecules, myosin and actin, form bonds -called cross bridges- where the myosin heads produce the mobilization of actin towards the center of the sarcomere. Z discs are associated with actin myofibrils, so they come close, and promote the shortening of the sarcomere.

This process requires the action of calcium ions, which depolarize the muscle cell and consume energy in the form of ATP.

It should be noted that the myosin and actin molecules do not change their length, but their action causes the muscle fibers to shorten during contraction.

Learn more:

Types of muscle contraction brainly.com/question/7117064

7 0
3 years ago
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