Which group of
e.coli produces a shiga toxin somewhat similar to that produced by shigella dysenteriae?

Cleavage as part of embryonic development is distinctive because it involves ________.

What is the leading cause of water pollution in the United States?

A student is asked to draw a food web in which the same organism is a primary consumer as well as a secondary consumer. how should the organism be represented in the food web?
a. the organism must have an arrow pointing from it to a tertiary consumer and another arrow pointed from it to a decomposer.
b. the organism must have an arrow pointing from it to a secondary consumer and another arrow pointing to it from the top predator.
c. the organism must have an arrow pointing to it from a producer and another arrow pointing to it from a primary consumer.
d. the organism must have an arrow pointing from it to primary consumer and another arrow pointing away from it to a decomposer.

How can you determine if your cardiovascular system is becoming more fit?

Name the muscular contractions that force the food downwards

how can the processes of parasitism and predation be different if they both harm organsims?

Flexor and extensor muscles work _______ to operate the joint.

A large explosion that takes place at the end of a star’s life cycle is called a ____________.
big bang
supernova
nebula
nuclear reaction

Species are disappearing almost a thousand times faster than they are forming. What is the main cause?

an energy pyramid illustrates that energy is a form of _____is lost to the surrounding as it is passed from one organism to the next???

Select the correct definition about tissue grafts.
a. allografts are between different species.
b. xenografts are between individuals of the same species.
c. isografts are between identical twins.
d. autografts are between two genetically identical individuals.

Which of these organizations acknowledges that the threat to wildlife and biodiversity is greater today than ever before ?
A. Convention on biological diversity
B. The fans at convention
C. World trade organization
D. Convention on international trade in endangered species

Science Help >~>~>~


A volcanic eruption adds carbon dioxide to the air. This is an example of interactions between the


1)

atmosphere and geosphere


2)

hydrosphere and geosphere


3)

hydrosphere and biosphere


4)

geosphere and biosphere

The dorsal fin of a shark is _____ to the dorsal fin of a dolphin. this anatomical feature is the result of convergent evolution (i.e., adaptation to similar environmental pressures).

What does the presence of similar genes in very dissimilar organisms imply? a the organisms do not share a common ancestor. b the genes became identical through mutation. c they must be in the same family. d the organisms share a common ancestor?

"tobacco smoke is responsible for what percentage of lung cancer deaths?"

A 20-year-old male is hospitalized with a 4-day history of cough and a temperature of 41°c. chest sounds are dull to percussion. a sputum gram stain is non-diagnostic. a blood culture is positive for gram-positive cocci in pairs. the recommended treatment is with __________.

John went to a picnic. he took home some leftover chicken and rice, heated it on the stove, ate it, and got sick two hours later. john thought the heating made his food safe because it would have killed any bacteria present. he didn't know that __________ produces a heat-stable toxin. view available hint(s)

Explain why lightning strikes can be dangerous even when an individual is not directly struck

Producers release carbon dioxide into the atmosphere during the process of photosynthesis. select one:
a. True
b. False

If a space in the structure is filled with minerals and then the original animal or plant part dissolves it called

One of the reasons for the success of the smallpox eradication campaign was that
a. smallpox viruses were used in the vaccine.
b. smallpox was not a transmissible disease.
c. smallpox occurred only in humans.
d. smallpox occurred only in south america.
e. smallpox could be treated with antibiotics.

What is the location of the sensory structures that translate things you see into nerve impulses?

A. On the retina
B. On the cornea
C. In the cochlea
D. In the olfactory bulb

What is the process within a genetic algorithm of randomly trying combinations and evaluating the success (or failure) of the outcome?

Which type of vaccines triggers the recipient's immune system to produce antitoxins?

About _______ of all body fluid is within cells and intracellular compartments. A. 1/3 B. 2/3 C. 1/2 D. 1/4

Normal fruit flies have brownish-yellow bodies, and this body color is dominant. a mutation in the gene for body color can produce flies with an ebony body color. a homozygous normal fruit fly (e
e. is crossed with a homozygous ebony fruit fly (ee). what is the predicted outcome of this genetic cross

Todd was startled when the door slammed shut. what part of the brainstem is responsible? todd was startled when the door slammed shut. what part of the brainstem is responsible? thalamus medulla midbrain pons

In an aquatic habitat, an example of organisms from the pioneer community would be - f water reeds g algae h water lilies j grass

Definition: this is the process of organisms adapting to their environments over time.