All of the following prevent pathogens from entering the human body excepta. red blood cells
b. tears
c. mucus
d. skin

Answers

Answer 1

Answer: A. red blood cells. They carry oxygen around the body, not protect from pathogens.

Related Questions

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Following replication of its DNA, each chromosome contains two _______ which are attached to each other by a centromere.
The total energy production of a mitochondrion is enhanced by its
What is common between aerobic and anaerobic respiration? A. Krebs cycle B. Electron transport chain C. Glycolysis
How do scientist explain the incomplete fossil record? A) The fossil record is limited to fossilized animals and the absence of fossilized plants. B) Stasis occurs when the structure of a species in the fossil record does not change over a long period of time. C) Not all organisms become fossils. Processes like erosion and mountain building can change rock layers, causing fossils to be spread over multiple layers or destroyed. D) The adaptive radiation of mammals helps explain a rapid increase in mammal diversity of the fossil record after a mass extinction.

How might chemosynthetic organisms help scientists to understand how life developed on earth?

Answers

Organisms that are chemosynthetic process chemosynthesis. It is a series of chemical reactions that convert the energy in food into ATP. In contrast to photosynthesis which is using sunlight to convert and create food from the gained resources such as water, carbon dioxide and the sunlight, itself.
These two process differ from which the product they process or undergo to produce food and converted into energy for the cell to use in its many cellular activities.

The muscles control decreasing pupil size in response to brighter light levels

Answers

Final answer:

The sphincter pupillae muscle controls decreasing pupil size in response to brighter light levels. This action protects the eye from potential damage. The process is involuntary and controlled by the autonomic nervous system.

Explanation:

The pupil size in our eyes is controlled by two muscles: the sphincter pupillae and the dilator pupillae. When we are exposed to brighter light levels, the sphincter pupillae muscle contracts, which causes the pupil to decrease in size. This acts as a protective mechanism to prevent too much light from entering the eye and possibly causing damage.

The functioning of these muscles are involuntary and controlled by the autonomic nervous system. In contrast, in lower light levels, the dilator pupillae muscle would contract to increase pupil size and allow more light in for improved vision.

Learn more about sphincter pupillae here:

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The statement is correct, the muscles control decreasing pupil size in response to brighter light levels.

Your eye's retina converts light into nerve impulses that travel down the optic nerve. The muscles that regulate the size of the pupil get some of these nerve signals from the optic nerve.

What function do chloroplasts perform?

Answers

Chloroplastswork to convert light energy of the Sun into sugars that can be used by cells.

Work to convert light energy of the Sun into sugars that can be used by cells.

Which gland sits atop each kidney?A. adrenal
B. thymus
C. pituitary
D. pancreas

Answers

The adrenal gland sits atop each kidney

What is the adrenal gland

The adrenal glands are small, triangular-shaped endocrine glands located on top of each kidney. They are composed of two parts: the outer adrenal cortex and the inner adrenal medulla.

The adrenal glands play a crucial role in producing and releasing various hormones that are essential for regulating metabolism, responding to stress, maintaining fluid balance, controlling blood pressure, and supporting immune function.

The hormones produced by the adrenal glands include cortisol, aldosterone, adrenaline (epinephrine), and noradrenaline (norepinephrine).

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The adrenal glands sit atop the kidneys

Trees that grow in a forest tend to grow very tall, with few branches. The same species of tree grown in an open area tends to grow shorter and wider, with many branches. The stimulus responsible for these different growth patterns is the amount of wind striking the tree
⊝

light reaching the tree
⊝

nutrients in the soil
⊝

water in the ground
⊝

Which one is it?

Answers

Light, water, and nutrients play a crucial role in the adaptation and evolution of species. The trees of the same species will be taller in the forests, whereas in the open grasslands the height of the trees will be short.

The correct answer is:

Option B. Light reaching the trees

The light plays a crucial role in the height of trees as:

1. Light is essential for the survival of trees. In a forest, a large number of organisms are present, which fight for shelter, food, and light. Thus, to achieve more light, trees are taller.

2. In opengrasslands, the trees are shorter and wider, because they do not have neighboring trees that fight for light and water.

Thus, the correct answer is Option B.

To know more about the light and height of trees, refer to the following link:

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Answer:

The correct answer is A) light reaching the tree

Explanation:

In a forest, there are lots of trees and they are all competing for sunlight so they are forced to focus all their energy on growing taller so they don't get stuck in the shadow of another tree, however, the trees that grow in a large, open area have little to no competition for sunlight, so they can relax and spread out their branches because there's lots of room.

When land is completely bare, with no topsoil present, the process of ___________ occurs on this newly formed land.primary succession
secondary succession
tertiary succession