When the egg of one species does not react with the sperm of another

species this is

1. gametic isolation

2. temporal isolation

3. behavioral isolation

4. geographic isolation

Why does the mid-day winter sun not produce as much intense heat as the mid-day summer sun? A. the Earth is further from the Sun B. the Sun is closer to the horizon C. the Sun's light is spread and diluted more D. the Sun is not up as long E.

What initially causes a nerve impulse

Some students are instructed to put a celery stalk in a red dye solution for a lab activity. First the students carefully cut the bottom of the stalk with a scalpel.

Both parents are pure dominant for brown eyes. What is the probability of them having a child with blue eyes?

During DNA replication, what is the first process to occur? a:zipping up of the DNA strand for copying b:synthesis of the leading strand c:synthesis of the lagging strand d:unwinding of the parental DNA by helicase enzyme

Which process produces two genetically identical somatic cells?

What type cell undergoes meiosis?

What type of instrument measures seismic waves? A. Mercalli scale B. Seismogram C. Seismic scale D. Seismometer

Which of the following is composed of two layers of lipids and protects the cell from the surrounding environment? Select one: a. cytoplasm b. cholesterol c. cell membrane d. carbohydrate

Predict how the thickness of cuticle and the number of stomata differ in plants from wet habitats versus dry habitats. drag the appropriate items to their respective bins.