1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Masja [62]
3 years ago
8

A stalked, sessile marine organism has several feathery feeding structures surrounding an opening through which food enters. The

organism could potentially be a cnidarian, a lophophorate, a tube-dwelling worm, a crustacean, or an echinoderm. Which of the following traits, if found in this organism, would allow the greatest certainty of identification?
Select one:a. a nervous systemb. the presence of what seems to be radial symmetryc. a digestive system with mouth and anus separate from each otherd. a hard covering made partly of calcium carbonatee. a water vascular system
Biology
1 answer:
yuradex [85]3 years ago
8 0

Answer:

        The right answer to this question is water vascular system.

Explanation:

        Through this system it's possible to identify it easily an echinoderm, that's why we can use it as a method of checking the information. But be careful, because for example, the radial symmetry, is not present in all the kinds of animals said on the question, shrimps are good examples, shrimps are part of the crustaceans. In this way, as you first see the organism, you are going to guess what it is by its appearance, and then you're going to analyse it properly after. Once you check it has a water vascular system, it's most probably to be an echinoderm.

You might be interested in
Which hormone is secreted during periods of stress and is related to increased risk of disease?
gulaghasi [49]

Stress is a condition that tends to disturb the equilibrium of the individual with the environment. There are hormonal changes which occur during stress and have their impact in the endocrine system.

Reaction to stress is associated with increased hormone secretions of several hormones such as glucocorticoids, growth hormone, prolactin and catecholamine. The elevated levels of these hormones increase the risk of infections and also decrease the innate immunity as well as increase the autoimmune responses.

There are endocrine disorders related with the increased hormone secretion during stress conditions such as psychosexual dwarfism, obesity, Grave’s disease and gonadal dysfunction. The effect of increased secretion of the hormones is increase in mobilization of energy and adaption of the individual to current circumstances.

Activation of the pituitary adrenal axis is an important and dominant response due to stress. On stimulation of the pituitary adrenal axis results in hypothalamic secretion of the CRF (corticotrophin-releasing factor) which further stimulates the pituitary to ACTH, 3-endorphin and 8-lipotropin.

During stress, the plasma levels of these hormones increase up to five times.

The stimulation of the pituitary adrenal axis is also associated with the release of hormone catecholamine. The increased level of catecholamine leads to increased skeletal muscle flow of blood increased cardiac output and glucose levels, bronchiolar dilation, cutaneous vasoconstriction etc.

Acute stress releases vasopressin rapidly from the Para ventricular nucleus of hypothalamus together with corticotrophin releasing hormone.

During stress there is also suppression of gonadotropins and gonadal steroidal hormones which disrupt the normal menstrual cycle and prolonged stress can also lead to impairment of reproductive functions.

Thyroid functions are down regulated during stress conditions. T3 and T4 levels decrease whenever there is any stress condition.

The growth hormone level increases due to physical stress and prolactin level may increase or decrease depending on the conditions of regulatory environment locally.

4 0
3 years ago
Which process occurs during the light-dependent reactions in photosynthesis?
kobusy [5.1K]

Answer:

A. Water molecules are split.

Explanation:

The light dependent reactions of photosynthesis require the energy in sunlight to proceed. Structures called photosystems which contain chlorophyll absorb the light from the sun to generate excited electrons, which are transferred to electron carriers ATP and NADH.

These electron carriers are used in the light-independent reactions of photosynthesis.

During this process,  the high energy electrons are passed to an acceptor molecule and replaced with an electron from water. This splitting of water produces H+ ions and oxygen as a byproduct. The splitting of water is called photolysis

3 0
2 years ago
A __________is designed to ride on trails.
zaharov [31]

Mountain Bike is the correct answer

8 0
3 years ago
Climate change is a ___ environmental change
vfiekz [6]

Answer:

Climate change is a <em><u>result of</u></em> environment change.

Explanation:

8 0
3 years ago
In normal skeletal muscle tissue, binding of acetylcholine to its receptors at the neuromuscular junction results in:
BARSIC [14]
<span>Answer: Opening of Na+ and K+ Explanation: Acetycholine binding opens Na+ and K+ ion channels in the receptors that allow simultaneous passage of Naâş into the muscle fiber and Kâş out of the muscle fiber. More Naâş ions enter than Kâş ions exit, which produces a local change in the membrane potential called the end plate potential. Binding of acetycholine to receptor proteins opens Na+ and K+ channels resulting in jump in resting membrane potential(RMP) from -90mV to +75mV forming an end-plate potential (EPP).</span>
3 0
3 years ago
Other questions:
  • What is the most basic unit of life?
    6·1 answer
  • Which of the following DNA mutations is most likely to damage the protein it specifies? A) a base-pair deletionB) an addition of
    8·1 answer
  • Draw what you think the models of aerobic respiration and anaerobic respiration would look like if you constructed them.
    11·1 answer
  • Which of the following are the three kinds of RNA?
    14·1 answer
  • How is a molecule different from a compound? Are all molecules compounds?
    8·1 answer
  • 16. Which of the following would be LEAST likely to lead to speciation? *
    6·1 answer
  • Bats and humans are both mammals and share a common ancestor. Because of this, a human arm and a bat wing have similar bone stru
    12·1 answer
  • Why do those in forestry need to be able to perform basic operations without the aid of digital technology?
    11·1 answer
  • What is the lowest level of organization
    14·2 answers
  • Objects that transmit light easily are?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!