Agrobacterium infects plants and causes them to form tumors. you are asked to determine how long a plant must be exposed to these bacteria to become infected. which of the following experiments will provide the best data to address that question?
a) measure the number of tumors formed on a plant when exposed to various concentrations of agrobacterium.
b) measure the number of tumors formed on plants, which are exposed to agrobacterium for different lengths of time.
c) determine the survival rate of agrobacterium when exposed to different concentrations of an antibiotic.
d) measure the concentration of agrobacterium in different soil environments where the plants grow.

B) Measure the number of tumors formed on plants, which are exposed to Agrobacterium for different lengths of time.

Explanation:

In an experimental procedure, the independent variable brings a change over the dependent variable. The changes in the independent variable can be done manually, which exerts it's influence over the dependent variable.

Here the time duration to which the plant is required to be exposed so that it receives a bacterial infection is required to be determined. Thus b is the correct option. This is because of the fact that infection will result in tumors which is dependent variable caused by the different length of time of exposure of the plant to the Agrobacterium which is the independent variable.

tsd is temerature dependent sex determination.

tsd: it is a type of environmental sex determination in which the temperature experienced during embryonic/ larval development (ambient temperature for development) determine the sex of the offspring.

crocodile displays the tsd where the ambient temperature of the developing egg determines the individual's sex. for example in the american alligator's eggs, incubation at 33 ºc produces mostly males, while incubation at 30 ºc produces mostly females. so if the american alligator's egg will get the ambient temperature (33 degree celcius)during embryonic development from egg, the offspring will be male and same for the female sex determination.

1. a host loses nutrients to a parasite

2. a parasite only benefits when the host is alive (cause if the host dies the parasite dies with it )

3. producers to consumers

4. the tapeworm is a parasite

5. they convert energy from the sun (photosynthesis)

6. sunflower-robin (i think im 80% sure)

7. producer

8. consumer

9. prey

10. fresh water snails ( cause the green algea is the producer and the snails are the primary consumers and the small fish consumer so is the big fish)