Seasonality occurs on planet Earth because of its ________ with respect to the plane it travels around the Sun
Fill in the blank(s) with correct word
axial tilt
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A variable trait in corn is the presence or absence of knobs at particular sites on some chromosomes. The allele present on each chromosome determines whether or not that chromosome has a knob. Suppose that one member of each of two pairs of homologs in a corn plant has a knob. If this plant is crossed with a knobless plant, what percentage of the offspring is expected to have only knobless chromosomes?
A) 100% B) 75% C) 50% D) 25% E) 0%
A child has a bicycle accident and is rushed to the ER. The doctors stop the bleeding, but the child needs a transfusion. Fortunately, the patient is AB-positive, so the doctors can give him ________
A) AB negative or positive only B) any blood type C) O positive only D) O negative only
What can best be defined as a contest between two species for limited resources?
a) competition b) transition c) predation d) parasitism
An animal ecologist interested in gradient analysis would:
A) measure the abundance of animal species and physical conditions at a number of locations and then plot the abundance of each species as a function of one or more physical conditions. B) perform controlled crosses among all animal species within a community to determine the extent to which the species are reproductively isolated. C) compare the relative concentrations of all essential elements found in tissue samples taken from all animal species within a community. D) characterize the trophic structure of the community by determining "who eats whom."