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zlopas [31]
3 years ago
7

Select all that apply.

Biology
2 answers:
liq [111]3 years ago
7 0

The correct answer are vascular, seed-bearing, fruit and flower producers.

Angiosperms are more advanced and complex as compared to that of gymnosperm. The angiosperm bears seed and they are vascular. The food, water and other materials are transported by the help of xylem and phloem. They are known as conducting tissues. Angiosperm bears fruit and flower as well. Flower attracts insects and helps in pollination. All the above characteristics make angiosperm different from gymnosperm.

Lynna [10]3 years ago
5 0
Angiosperms are vascular, seed-bearing, and fruit and flower producers.
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What have the scientific studies identified as the major cause of acid rain in the united states?.
Vadim26 [7]

Burning of fossil fuels that release sulphur and nitrogen compounds into the air is identified as the major cause of acid rain in the united states.

<h3>What are the causes of acid rain?</h3>
  • Acid Rain is created when sulphate and nitrogen oxides from the atmosphere react with rainwater and fall as a result.
  • Sulphur and nitrogen particles that mix with the wet elements of rain are the main causes in the production of acid rain.
  • Due to air pollutants, notably the excessive levels of sulphur and nitrogen released by machinery and industrial operations, acid rain is made up of water droplets that are extremely acidic.
  • The emissions that are released from industries are man-made causes.
  • The natural causes, such as lightning strikes in the atmosphere that release nitrogen oxides and volcanic eruptions that release sulphur oxide.

The complete question is :

What have the scientific studies identified as the major cause of acid rain in the United States?

a )chemicals still in the atmosphere from the asteroid collision with the earth

b) excess solar radiation due to the depletion of the ozone layer

c) volcanic ash in the air

d) burning of fossil fuels that release sulphur and nitrogen compounds into the air

To learn more about acid rain , refer:

brainly.com/question/6700006

#SPJ4

3 0
1 year ago
What is an endemic species?
natima [27]

Endemism

Endemism is the state of a species being native to a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsewhere.

Explanation:

Endemic species are those that are found in just one region and nowhere else in the world. For example, kangaroos are originally endemic to Australia and are found nowhere else in the world. ... The Tasmanian Tiger is one such animal that was endemic to Australia, Tasmania and New Guinea. But now, it is extinct.

4 0
3 years ago
Read 2 more answers
What is the purpose of the pericardial sac that surrounds the heart in mammals
Nitella [24]

Answer:

Pericardial sac has protective tole

Explanation:

Pericardial sac or pericardium is a fibrous tissue that surrounds the heart. It has two coats:

  1. the outter coat-parietal pericardium
  2. the inner coat-visceral pericardium or epicardium which is double-layered and contains pericardial fluid between those two layers (pericardial fluid is necessary as a lubricant for the heart movement).

Besides lubrication, percardium also protects heart from infections, fixes it and limits its movements.

6 0
3 years ago
Which optical phenomena are formed by ice crystals?
azamat
Halo, any of a wide range of atmospheric optical phenomena
6 0
2 years ago
Is blood clotting an example of a positive or negative feedback mechanism? Explain your answer based on the description of the m
serg [7]

Answer:

Blood clothing is an example of positive feedback.

This type of feedback mechanism is useful to the body because it multiplies the factor that intervenes in clotting accelerating the process.

If a toxin affects the molecules that signal for platelets the feedback will not be effective enough to produce clotting and the body will keep bleeding.

Explanation:

Blood clotting is an example of positive feedback due to the fact that when the vascular endothelium is damaged  platelets will go to this area and activate themselves once they are in contact with the collagen fibers of the damaged structure. When the platelets are activated they will release the contents that is stored in their granules. One of the contents is a Gq-linked protein receptor cascade,  that will increase the concentration of calcium in the platelets. Calcium activates protein kinase C, which, in turn, activates phospholipase A2 (PLA2). PLA2  will modifies  an  integrin membrane  increasing its affinity to bind fibrinogen. The activated platelets change their  shape , and the fibrinogen cross-links with the integrin membrane aiding  in  the aggregation of adjacent platelets. After this the coagulation cascade takes place. there are two pathways the extrinsic  and the extrinsic one.

The extrinsic pathway will be activated due to tissular factor released  by the platelets and the intrinsic pathway will be activated due to endothelial collagen. The final product of both pathways is factor x.

Factor x will transform prothrombin into thrombin will activate the conversion of fibrinogen into fibrin. Thrombin will form a net of fibrin that will the clot.

A cascade reaction is useful because every component of the cascade are related making a quick reaction once that one of then is activated and can activate other or more factors.

If a toxin affects the molecules that signals for platelets, platelets will not go to the damaged area and in consequence there will not be thrombin and fibrin to form the clot together with platelets.

7 0
3 years ago
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